Carbon And Its Compounds Online Test 9th Science Lesson 15 Questions in English
Carbon And Its Compounds Online Test 9th Science Lesson 15 Questions in English
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                        Question 1 of 1001. Question1. Carbon is the _______ element denoted by the symbol ______. Correct
 Carbon is one of the most important non-metallic elements. It is a chemical element with the symbol C and atomic number 6. Incorrect
 Carbon is one of the most important non-metallic elements. It is a chemical element with the symbol C and atomic number 6. 
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                        Question 2 of 1002. Question2. Who named carbon from the Latin word Carbo? Correct
 Antoine Lavoisier named Carbon from the Latin word ‘Carbo’ meaning coal. Incorrect
 Antoine Lavoisier named Carbon from the Latin word ‘Carbo’ meaning coal. 
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                        Question 3 of 1003. Question3. Assertion (A): Carbon is the main constituent of coal and present in all the living forms. 
 Reasoning (R): Coal is a fossil fuel developed from the decomposition of buried plants and animals.Correct
 Carbon is the main constituent of coal. Coal is a fossil fuel developed from prolonged decomposition of buried plants and animals. So it is clear that all the life forms contain carbon. Incorrect
 Carbon is the main constituent of coal. Coal is a fossil fuel developed from prolonged decomposition of buried plants and animals. So it is clear that all the life forms contain carbon. 
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                        Question 4 of 1004. Question4. What percentage of carbon dioxide is present in the earth’s atmosphere? Correct
 The earth atmosphere has only 0.03% of carbon dioxide (i.e.300 parts per million by weight). Incorrect
 The earth atmosphere has only 0.03% of carbon dioxide (i.e.300 parts per million by weight). 
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                        Question 5 of 1005. Question5. Assertion (A): Earth crust contains 0.032% of carbon in various forms. 
 Reasoning (R): Carbon compounds are very important element in everyday life of human.Correct
 The earth’s crust contains only 0.032% of carbon (i.e.320 parts per million by weight) in the form of minerals like carbonates, coal and petroleum. Even though available in small amount in nature, carbon compounds have an immense importance in everyday life. Incorrect
 The earth’s crust contains only 0.032% of carbon (i.e.320 parts per million by weight) in the form of minerals like carbonates, coal and petroleum. Even though available in small amount in nature, carbon compounds have an immense importance in everyday life. 
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                        Question 6 of 1006. Question6. In which of these substances carbon is not present? Correct
 Carbon is present in our muscles, bones, organs, blood and other components of living matter. Incorrect
 Carbon is present in our muscles, bones, organs, blood and other components of living matter. 
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                        Question 7 of 1007. Question7. What is the other name of the Carbon chemistry? Correct
 Carbon Chemistry is also called as Living Chemistry. Without carbon there is no possibility for the existence of plants and animals including human. Incorrect
 Carbon Chemistry is also called as Living Chemistry. Without carbon there is no possibility for the existence of plants and animals including human. 
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                        Question 8 of 1008. Question8. What are known forms of carbon from the ancient times? Correct
 Carbon has been known since ancient times in the form of soot, charcoal, graphite and diamonds. Incorrect
 Carbon has been known since ancient times in the form of soot, charcoal, graphite and diamonds. 
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                        Question 9 of 1009. Question9. What was the conclusion of the experiments done by Antoine Lavoisier in 1772? Correct
 In 1772, French scientist Antoine Lavoisier pooled resources with other chemists to buy a diamond, which they placed in a closed glass jar they focused the Sun’s rays on the diamond with a remarkable giant magnifying glass and saw the diamond burn and disappear. Lavoisier noted that the overall weight of the jar was unchanged and that when it burned, the diamond had combined with oxygen to form carbon dioxide. He concluded that diamond and charcoal were made of the same element – carbon. Incorrect
 In 1772, French scientist Antoine Lavoisier pooled resources with other chemists to buy a diamond, which they placed in a closed glass jar they focused the Sun’s rays on the diamond with a remarkable giant magnifying glass and saw the diamond burn and disappear. Lavoisier noted that the overall weight of the jar was unchanged and that when it burned, the diamond had combined with oxygen to form carbon dioxide. He concluded that diamond and charcoal were made of the same element – carbon. 
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                        Question 10 of 10010. Question10. Name the scientist who showed burnt graphite forms carbon dioxide? Correct
 In 1779, Swedish scientist Carl Scheele showed that graphite also burned to form carbon dioxide. Incorrect
 In 1779, Swedish scientist Carl Scheele showed that graphite also burned to form carbon dioxide. 
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                        Question 11 of 10011. Question11. Who proved that diamond is a pure carbon? Correct
 In 1796, English chemist Smithson Tennant established that diamond is pure carbon and not a compound of carbon and it burned to form only carbon dioxide. Incorrect
 In 1796, English chemist Smithson Tennant established that diamond is pure carbon and not a compound of carbon and it burned to form only carbon dioxide. 
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                        Question 12 of 10012. Question12. What was the conclusion of the experiments done by Francis Bundy at General Electric company? Correct
 In 1855, English chemist Benjamin Brodie produced pure graphite from carbon, proving graphite is a form of carbon. Although it had been previously attempted without success, in 1955 American scientist Francis Bundy and his co-workers at ‘General Electric’ company finally demonstrated that graphite could be transformed into diamond at high temperature and pressure. Incorrect
 In 1855, English chemist Benjamin Brodie produced pure graphite from carbon, proving graphite is a form of carbon. Although it had been previously attempted without success, in 1955 American scientist Francis Bundy and his co-workers at ‘General Electric’ company finally demonstrated that graphite could be transformed into diamond at high temperature and pressure. 
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                        Question 13 of 10013. Question13. In which year a new form of carbon, fullerenes were discovered by scientists? Correct
 In 1985, Robert Curl, Harry Kroto and Richard Smalley discovered fullerenes, a new form of carbon in which the atoms are arranged in soccer-ball shapes. Incorrect
 In 1985, Robert Curl, Harry Kroto and Richard Smalley discovered fullerenes, a new form of carbon in which the atoms are arranged in soccer-ball shapes. 
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                        Question 14 of 10014. Question14. Choose the Incorrect statements regarding Graphene. 
 i) It consists of single layer of carbon atoms in hexagon arrangement.
 ii) It was discovered in the year 1985.
 iii) Kostya Novoselov and Andre Geim discovered graphene.Correct
 Graphene consists of a single layer of carbon atoms arranged in hexagons. Graphene’s discovery was announced in 2004 by Kostya Novoselov and Andre Geim. Incorrect
 Graphene consists of a single layer of carbon atoms arranged in hexagons. Graphene’s discovery was announced in 2004 by Kostya Novoselov and Andre Geim. 
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                        Question 15 of 10015. Question15. Which of these statements is true? Correct
 Carbon is found both in Free State as well as combined state in nature. Incorrect
 Carbon is found both in Free State as well as combined state in nature. 
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                        Question 16 of 10016. Question17. Match the origin of the scientists. 
 A. Smithson Tennant i) France
 B. Carl Scheele ii) England
 C. Antoine Lavoisier iii) America
 D. Francis Bundy iv) SwedenCorrect
 French scientist Antoine Lavoisier, Swedish scientist Carl Scheele, English chemist Smithson Tennant, American scientist Francis Bundy did various experiments on carbon and its compounds. Incorrect
 French scientist Antoine Lavoisier, Swedish scientist Carl Scheele, English chemist Smithson Tennant, American scientist Francis Bundy did various experiments on carbon and its compounds. 
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                        Question 17 of 10017. Question16. On what basis Berzelius classifies the carbon compounds? Correct
 In the early 19th century, Berzelius classified carbon compounds based on their source. Incorrect
 In the early 19th century, Berzelius classified carbon compounds based on their source. 
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                        Question 18 of 10018. Question18. Which of these carbon compounds are found in living organisms? Correct
 Organic Carbon Compounds: These are the compounds of carbon obtained from living organisms such as plants and animals. e.g. Ethanol, cellulose, Starch. Incorrect
 Organic Carbon Compounds: These are the compounds of carbon obtained from living organisms such as plants and animals. e.g. Ethanol, cellulose, Starch. 
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                        Question 19 of 10019. Question19. Assertion (A): Calcium carbonate is an inorganic carbon compound. 
 Reasoning (R): Inorganic carbon compounds are obtained from the non-living matters.Correct
 Inorganic Carbon Compounds: These are the compounds containing carbon but obtained from non-living matter. e.g. Calcium Carbonate, Carbon Monoxide, Carbon dioxide. Incorrect
 Inorganic Carbon Compounds: These are the compounds containing carbon but obtained from non-living matter. e.g. Calcium Carbonate, Carbon Monoxide, Carbon dioxide. 
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                        Question 20 of 10020. Question20. Choose the Incorrect statements. 
 i) Organic carbon compounds are connected with elements like hydrogen, oxygen and nitrogen.
 ii) Organic carbon compounds are classified based on their sources.
 iii) Hydrocarbons, alcohols and amino acids are various organic carbon compounds.Correct
 There are millions of organic carbon compounds available in nature and also synthesized manually. Organic carbon compounds contain carbon connected with other elements like hydrogen, oxygen, nitrogen, sulphur etc. Thus, depending on the nature of other elements and the way in which they are connected with carbon, there are various classes of organic carbon compounds such as hydrocarbons, alcohols, aldehydes and ketones, carboxylic acids, amino acids. Incorrect
 There are millions of organic carbon compounds available in nature and also synthesized manually. Organic carbon compounds contain carbon connected with other elements like hydrogen, oxygen, nitrogen, sulphur etc. Thus, depending on the nature of other elements and the way in which they are connected with carbon, there are various classes of organic carbon compounds such as hydrocarbons, alcohols, aldehydes and ketones, carboxylic acids, amino acids. 
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                        Question 21 of 10021. Question21. Which is not a major class of Inorganic carbon compounds? Correct
 As compared to organic compounds the number of inorganic carbon compounds is limited. Among them oxides, carbides, sulphides, cyanides, carbonates and bicarbonates are the major classes of inorganic carbon compounds. Incorrect
 As compared to organic compounds the number of inorganic carbon compounds is limited. Among them oxides, carbides, sulphides, cyanides, carbonates and bicarbonates are the major classes of inorganic carbon compounds. 
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                        Question 22 of 10022. Question22. Which of these are added to the atmosphere by incomplete combustion of fuels? Correct
 Carbon monoxide (CO) is not a natural component of air. Mainly added to atmosphere due to incomplete combustion of fuels. Incorrect
 Carbon monoxide (CO) is not a natural component of air. Mainly added to atmosphere due to incomplete combustion of fuels. 
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                        Question 23 of 10023. Question23. Which is a main component of the water gas? Correct
 Carbon monoxide is the main component of water gas (CO+H2). Incorrect
 Carbon monoxide is the main component of water gas (CO+H2). 
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                        Question 24 of 10024. Question25. In which of these carbon dioxide is not used? Correct
 Uses of CO2: Fire extinguisher, preservative for fruits, making bread, to manufacture urea, carbonated water, nitrogenous fertilizers, dry ice in refrigerator. Incorrect
 Uses of CO2: Fire extinguisher, preservative for fruits, making bread, to manufacture urea, carbonated water, nitrogenous fertilizers, dry ice in refrigerator. 
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                        Question 25 of 10025. Question24. Assertion (A): Carbon dioxide is found in combined forms in nature. 
 Reasoning (R): Combined forms of carbon dioxide are found in minerals.Correct
 Carbon dioxide occurs in nature as free and combined forms. Combined form is found in minerals like limestone, magnesite. It is formed by complete combustion of carbon or coke. Incorrect
 Carbon dioxide occurs in nature as free and combined forms. Combined form is found in minerals like limestone, magnesite. It is formed by complete combustion of carbon or coke. 
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                        Question 26 of 10026. Question25. In which of these carbon dioxide is not used? Correct
 Uses of CO2: Fire extinguisher, preservative for fruits, making bread, to manufacture urea, carbonated water, nitrogenous fertilizers, dry ice in refrigerator. Incorrect
 Uses of CO2: Fire extinguisher, preservative for fruits, making bread, to manufacture urea, carbonated water, nitrogenous fertilizers, dry ice in refrigerator. 
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                        Question 27 of 10027. Question26. Which of this carbon compound is not colorless? Correct
 Incorrect
 
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                        Question 28 of 10028. Question27. Choose the correct statements regarding Calcium carbide. 
 i) It appears as a Greyish black solid.
 ii) Prepared by heating calcium oxide and coke.
 iii) Used to manufacture graphite and hydrogen.Correct
 Incorrect
 
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                        Question 29 of 10029. Question28. Which is not a property of carbon disulphide? Correct
 Carbon disulphide (CS2) is a Colorless, inflammable, highly poisonous gas. Incorrect
 Carbon disulphide (CS2) is a Colorless, inflammable, highly poisonous gas. 
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                        Question 30 of 10030. Question29. Which of this compound is insoluble in water? Correct
 Incorrect
 
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                        Question 31 of 10031. Question31. What are the uses of carbon disulphide? Correct
 Uses of Carbon disulphide: Solvent for sulphur, to manufacture rayon, fungicide, insecticide. Incorrect
 Uses of Carbon disulphide: Solvent for sulphur, to manufacture rayon, fungicide, insecticide. 
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                        Question 32 of 10032. Question32. Which of these are used to produce Calcium carbonate? Correct
 Calcium Carbonate (CaCO3) : Prepared by passing Carbon dioxide into the solution of slaked lime. Incorrect
 Calcium Carbonate (CaCO3) : Prepared by passing Carbon dioxide into the solution of slaked lime. 
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                        Question 33 of 10033. Question33. What is the color of sodium bicarbonate? Correct
 Sodium bicarbonate (NaHCO3): White crystalline substance, sparingly soluble in water. Incorrect
 Sodium bicarbonate (NaHCO3): White crystalline substance, sparingly soluble in water. 
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                        Question 34 of 10034. Question34. Match 
 A. Carbon disulphide i) Antacid
 B. Calcium Carbonate ii) Baking powder
 C. Sodium bicarbonate iii) Acetylene gas
 D. Calcium Carbide iv) RayonCorrect
 Incorrect
 
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                        Question 35 of 10035. Question35. Catenation, 
 i) Binding of an element to itself.
 ii) Form open chains by covalent bonds.
 iii) Binding of an element to itself or with other elements.
 iv) Covalent bonds form open chains or close chain compoundsCorrect
 Catenation is binding of an element to itself or with other elements through covalent bonds to form open chain or closed chain compounds. Incorrect
 Catenation is binding of an element to itself or with other elements through covalent bonds to form open chain or closed chain compounds. 
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                        Question 36 of 10036. Question36. Which of these chain structures are formed by the carbon atoms through covalent bonds? Correct
 Carbon is the most common element which undergoes catenation and forms long chain compounds. Carbon atom links repeatedly to itself through covalent bond to form linear chain, branched chain or ring structure. Incorrect
 Carbon is the most common element which undergoes catenation and forms long chain compounds. Carbon atom links repeatedly to itself through covalent bond to form linear chain, branched chain or ring structure. 
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                        Question 37 of 10037. Question37. Which of the carbon property is dealt by the organic chemistry? Correct
 This property of catenations carbon itself is the reason for the presence of large number of organic carbon compounds. So organic chemistry essentially deals with catenated carbon compounds. Incorrect
 This property of catenations carbon itself is the reason for the presence of large number of organic carbon compounds. So organic chemistry essentially deals with catenated carbon compounds. 
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                        Question 38 of 10038. Question38. How many electrons are in the outermost orbit of carbon? Correct
 Another versatile nature of carbon is its tetravalency. The shell electronic configuration of carbon is 2, 4 (Atomic no: 6). It has four electrons in its outermost orbit. Incorrect
 Another versatile nature of carbon is its tetravalency. The shell electronic configuration of carbon is 2, 4 (Atomic no: 6). It has four electrons in its outermost orbit. 
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                        Question 39 of 10039. Question39. Which is the nearest noble gas that could be reached by tetravalency of carbon? Correct
 According to Octet Rule, carbon requires four electrons to attain nearest noble gas (Neon) electronic configuration. So carbon has the tendency to share its four electrons with other atoms to complete its octet. This is called its tetravalency. Incorrect
 According to Octet Rule, carbon requires four electrons to attain nearest noble gas (Neon) electronic configuration. So carbon has the tendency to share its four electrons with other atoms to complete its octet. This is called its tetravalency. 
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                        Question 40 of 10040. Question40. Which of this bond is used for combining tetravalent carbon with other elements? Correct
 40. Which of this bond is used for combining tetravalent carbon with other elements? Incorrect
 40. Which of this bond is used for combining tetravalent carbon with other elements? 
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                        Question 41 of 10041. Question41. Assertion (A): The nature of bonding is a primary factor of a compound. 
 Reasoning (R): The physical and chemical characteristics of a compound are determined by the nature of bonding.Correct
 The nature of bonding in a compound is the primary factor which determines the physical and chemical characteristics of a compound. Incorrect
 The nature of bonding in a compound is the primary factor which determines the physical and chemical characteristics of a compound. 
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                        Question 42 of 10042. Question42. What is the main reason for the existence of various classes of carbon compounds? Correct
 The ability of carbon to form multiple bonds is the main reason for the existence of various classes of carbon compounds. Incorrect
 The ability of carbon to form multiple bonds is the main reason for the existence of various classes of carbon compounds. 
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                        Question 43 of 10043. Question43. Match 
 A. Ethene i) Alkane
 B. Methane ii) Alkyne
 C. Ethyne iii) AlkeneCorrect
 Incorrect
 
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                        Question 44 of 10044. Question44. Which of this hydrocarbon has a triple bond configuration? Correct
 Alkyne class of compounds has triple bond configuration example is Ethyne. Incorrect
 Alkyne class of compounds has triple bond configuration example is Ethyne. 
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                        Question 45 of 10045. Question45. Which of these elements replace the hydrogen in hydrocarbons to form various functional groups? Correct
 When one or more hydrogen in hydrocarbons is replaced by other elements like O, N, S, halogens, etc., a variety of compounds having different functional groups is produced. Incorrect
 When one or more hydrogen in hydrocarbons is replaced by other elements like O, N, S, halogens, etc., a variety of compounds having different functional groups is produced. 
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                        Question 46 of 10046. Question46. What is the special feature of catenated organic carbon compounds? Correct
 Isomerism is another special feature of carbon compounds especially found in catenated organic compounds. Incorrect
 Isomerism is another special feature of carbon compounds especially found in catenated organic compounds. 
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                        Question 47 of 10047. Question47. Assertion (A): The total number of atoms is represented in the molecular formula of an organic compound. 
 Reasoning (R): The molecular formula denotes the arrangement of atoms and the structure.Correct
 The molecular formula of an organic compound represents only the number of different atoms present in that compound. It does not tell about the way in which the atoms are arranged and hence its structure. Without knowing the structure, we can’t name it. Incorrect
 The molecular formula of an organic compound represents only the number of different atoms present in that compound. It does not tell about the way in which the atoms are arranged and hence its structure. Without knowing the structure, we can’t name it. 
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                        Question 48 of 10048. Question48. Define isomerism. Correct
 A given molecular formula may lead to more than one arrangement of atoms. Such compounds are having different physical and chemical properties. This phenomenon in which the same molecular formula may exhibit different structural arrangement is called isomerism. Incorrect
 A given molecular formula may lead to more than one arrangement of atoms. Such compounds are having different physical and chemical properties. This phenomenon in which the same molecular formula may exhibit different structural arrangement is called isomerism. 
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                        Question 49 of 10049. Question49. Which is the origin of the word isomers? Correct
 Compounds that have the same molecular formula but different structural formula are called isomers (Greek, isos = equal, meros = parts). Incorrect
 Compounds that have the same molecular formula but different structural formula are called isomers (Greek, isos = equal, meros = parts). 
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                        Question 50 of 10050. Question50. Assertion (A): Allotropy elements can exist in more than one form. 
 Reasoning (R): The physical and chemical characteristics are same for allotropes.Correct
 Allotropy is a property by which an element can exist in more than one form that is physically different and chemically similar. Incorrect
 Allotropy is a property by which an element can exist in more than one form that is physically different and chemically similar. 
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                        Question 51 of 10051. Question51. What is the main reason for the existence of allotropes? Correct
 The different forms of that element are called its allotropes. The main reason for the existence of allotropes of an element is its method of formation or preparation. Incorrect
 The different forms of that element are called its allotropes. The main reason for the existence of allotropes of an element is its method of formation or preparation. 
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                        Question 52 of 10052. Question52. How many allotropes of carbon are classified based on their physical nature? Correct
 Incorrect
 
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                        Question 53 of 10053. Question53. Choose the correct statements about Diamond. 
 i) Each carbon atom forms four covalent bonds.
 ii) Atoms are arranged in tetrahedral fashion.
 iii) The arrangement of diamond is the reason for the hardness and rigidity.Correct
 Diamond: In diamond, each carbon atom shares its four valence electrons with four other carbon atoms forming four covalent bonds. Here the atoms are arranged in repeated tetrahedral fashion which leads to a three dimensional structure accounting for its hardness and rigidity. Incorrect
 Diamond: In diamond, each carbon atom shares its four valence electrons with four other carbon atoms forming four covalent bonds. Here the atoms are arranged in repeated tetrahedral fashion which leads to a three dimensional structure accounting for its hardness and rigidity. 
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                        Question 54 of 10054. Question54. Why graphite is softer than diamond? Correct
 Graphite: In graphite, each carbon atom is bonded to three other carbon atoms through covalent bonds in the same plane. This arrangement forms hexagonal layers which are held together one over other by weak Vander Waals forces. Since the layers are held by weak forces graphite is softer than diamond. Incorrect
 Graphite: In graphite, each carbon atom is bonded to three other carbon atoms through covalent bonds in the same plane. This arrangement forms hexagonal layers which are held together one over other by weak Vander Waals forces. Since the layers are held by weak forces graphite is softer than diamond. 
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                        Question 55 of 10055. Question55. How many carbon atoms are present in the Buckminster fullerene? Correct
 Fullerene: The third crystalline allotrope of carbon is fullerene. The best known fullerene is Buckminster fullerene, which consists of 60 carbon atoms joined together in a series of 5- and 6- membered to form spherical molecule resembling a soccer ball. So its formula is C60. Incorrect
 Fullerene: The third crystalline allotrope of carbon is fullerene. The best known fullerene is Buckminster fullerene, which consists of 60 carbon atoms joined together in a series of 5- and 6- membered to form spherical molecule resembling a soccer ball. So its formula is C60. 
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                        Question 56 of 10056. Question56. What is the shape of the molecular arrangement of the Buckminster fullerene? Correct
 The best known fullerene is Buckminster fullerene, which consists of 60 carbon atoms joined together in a series of 5- and 6- membered to form spherical molecule resembling a soccer ball. Incorrect
 The best known fullerene is Buckminster fullerene, which consists of 60 carbon atoms joined together in a series of 5- and 6- membered to form spherical molecule resembling a soccer ball. 
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                        Question 57 of 10057. Question57. What is the pet name for the Buckminster fullerene? Correct
 The allotrope was named as Buckminster fullerene after the American architect Buckminster fuller. Because its structure reminded the framework of dome shaped halls designed by Fuller for large international exhibitions, it is called by the pet name Bucky Ball. Incorrect
 The allotrope was named as Buckminster fullerene after the American architect Buckminster fuller. Because its structure reminded the framework of dome shaped halls designed by Fuller for large international exhibitions, it is called by the pet name Bucky Ball. 
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                        Question 58 of 10058. Question58. Which is the highest fullerene available? Correct
 A large family of fullerenes exists, starting at C20 and reaching up to C540. Incorrect
 A large family of fullerenes exists, starting at C20 and reaching up to C540. 
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                        Question 59 of 10059. Question59. Choose the Incorrect statements regarding Diamond. 
 i) Each carbon in diamond has four covalent bonds.
 ii) Diamonds are Hard, heavy and transparent.
 iii) It is a conductor of heat and electricity.Correct
 Incorrect
 
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                        Question 60 of 10060. Question60. The Graphite, 
 i) Each carbon has three covalent bonds
 ii) Planar layers of hexagon units.
 iii) Soft, slippery to touch and opaqueCorrect
 Incorrect
 
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                        Question 61 of 10061. Question61. What is the shape of arrangement of the carbon atoms in the Graphene? Correct
 Graphene is most recently produced allotrope of carbon which consists of honeycomb shaped hexagonal ring repeatedly arranged in a plane. Incorrect
 Graphene is most recently produced allotrope of carbon which consists of honeycomb shaped hexagonal ring repeatedly arranged in a plane. 
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                        Question 62 of 10062. Question62. Assertion (A): Graphene is the thinnest compound and the lightest known material. 
 Reasoning (R): Graphene is stronger than steel.Correct
 Graphene is the thinnest compound known to man at one atom thick. It is the lightest material known (with 1 square metres weighing around 0.77 milligrams) and the strongest compound discovered (100-300 times stronger than steel). It is a best conductor of heat at room temperature. Incorrect
 Graphene is the thinnest compound known to man at one atom thick. It is the lightest material known (with 1 square metres weighing around 0.77 milligrams) and the strongest compound discovered (100-300 times stronger than steel). It is a best conductor of heat at room temperature. 
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                        Question 63 of 10063. Question63. Which of these results in the stacking of graphene layers? Correct
 Layers of graphene are stacked on top of each other to form graphite, with an inter planar spacing of 0.335 nanometers. The separate layers of graphene in graphite are held together by Vander Waals forces. Incorrect
 Layers of graphene are stacked on top of each other to form graphite, with an inter planar spacing of 0.335 nanometers. The separate layers of graphene in graphite are held together by Vander Waals forces. 
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                        Question 64 of 10064. Question64. What is the property of an amorphous form of carbon? Correct
 In amorphous form of carbon, carbon atoms are arranged in random manner. These forms of carbon are obtained when wood is heated in the absence of air. E.g., charcoal Incorrect
 In amorphous form of carbon, carbon atoms are arranged in random manner. These forms of carbon are obtained when wood is heated in the absence of air. E.g., charcoal 
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                        Question 65 of 10065. Question65. Assertion (A): All the Allotropic compounds of carbon are available as hard solids 
 Reasoning (R): Carbon is a metal compound.Correct
 Carbon is a non-metal found in various allotropic forms from soft powder to hard solid. Incorrect
 Carbon is a non-metal found in various allotropic forms from soft powder to hard solid. 
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                        Question 66 of 10066. Question66. In which of these forms the allotropic carbon compounds are available? Correct
 All the allotropic forms of carbon are solids whereas its compounds exist in solid, liquid and gaseous state. Incorrect
 All the allotropic forms of carbon are solids whereas its compounds exist in solid, liquid and gaseous state. 
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                        Question 67 of 10067. Question67. Which of the carbon forms are black in color? Correct
 Amorphous forms of carbon and graphite are almost black in color and opaque. Diamond is transparent and shiny. Incorrect
 Amorphous forms of carbon and graphite are almost black in color and opaque. Diamond is transparent and shiny. 
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                        Question 68 of 10068. Question68. The ______ forms of carbon have low _____. Correct
 Carbon amorphous forms have low melting and boiling point compared to crystalline forms. Incorrect
 Carbon amorphous forms have low melting and boiling point compared to crystalline forms. 
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                        Question 69 of 10069. Question69. Assertion (A): Carbon is insoluble in water and other solvents. 
 Reasoning (R): Ethanol is a compound of carbon is soluble in water.Correct
 Carbon is insoluble in water and other common solvents. But some of its compounds are soluble in water and other solvents. e.g., Ethanol, CO2 are soluble in water. Incorrect
 Carbon is insoluble in water and other common solvents. But some of its compounds are soluble in water and other solvents. e.g., Ethanol, CO2 are soluble in water. 
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                        Question 70 of 10070. Question70. Choose the Incorrect statements. 
 i) Elemental carbon undergoes no reaction at room temperature.
 ii) Carbon compounds are limited number of reactions at elevated temperatures.
 iii) Carbon compounds undergo large number of reactions at room temperature.Correct
 Elemental carbon undergoes no reaction at room temperature and limited number of reactions at elevated temperatures. But its compounds undergo large number of reactions even at room temperature. Incorrect
 Elemental carbon undergoes no reaction at room temperature and limited number of reactions at elevated temperatures. But its compounds undergo large number of reactions even at room temperature. 
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                        Question 71 of 10071. Question71. Which of this reaction produces the oxides of carbon? Correct
 Oxidation – (Reaction with oxygen) Carbon combines with oxygen to form its oxides like carbon monoxide (CO) and carbon dioxide (CO2) with evolution of heat. Incorrect
 Oxidation – (Reaction with oxygen) Carbon combines with oxygen to form its oxides like carbon monoxide (CO) and carbon dioxide (CO2) with evolution of heat. 
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                        Question 72 of 10072. Question72. Which of this carbon produces flame in the combustion? Correct
 Organic carbon compounds like hydrocarbon also undergo oxidation to form oxides and steam with evolution of heat and flame. This is otherwise called combustion. 
 2C(s) + O2(g) → 2CO(g)+ heat
 C(s) + O2(g) → CO2(g) + heat
 CH4(g) + 2O2(g) → CO2(g)+ 2H2O(g) + heatIncorrect
 Organic carbon compounds like hydrocarbon also undergo oxidation to form oxides and steam with evolution of heat and flame. This is otherwise called combustion. 
 2C(s) + O2(g) → 2CO(g)+ heat
 C(s) + O2(g) → CO2(g) + heat
 CH4(g) + 2O2(g) → CO2(g)+ 2H2O(g) + heat
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                        Question 73 of 10073. Question73. Which of these are resulted in the reaction of steam and carbon? Correct
 Carbon reacts with steam to form carbon monoxide and hydrogen. C(s) + H2O(g) → CO(g) + H2(g) Incorrect
 Carbon reacts with steam to form carbon monoxide and hydrogen. C(s) + H2O(g) → CO(g) + H2(g) 
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                        Question 74 of 10074. Question74. What is the other name of the carbon monoxide and hydrogen mixture? Correct
 The mixture of carbon monoxide and hydrogen is called water gas. Incorrect
 The mixture of carbon monoxide and hydrogen is called water gas. 
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                        Question 75 of 10075. Question75. In which of these conditions carbon reacts with sulphur? Correct
 With sulphur, carbon forms its disulphide at high temperature. 
 C(s) + 2S(g) → CS2(g)Incorrect
 With sulphur, carbon forms its disulphide at high temperature. 
 C(s) + 2S(g) → CS2(g)
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                        Question 76 of 10076. Question76. Which of these react with carbon and produces its carbides? Correct
 At elevated temperatures carbon reacts with some metals like iron, tungsten, titanium to form their carbides. Tungsten + Carbon → Tungsten carbide Incorrect
 At elevated temperatures carbon reacts with some metals like iron, tungsten, titanium to form their carbides. Tungsten + Carbon → Tungsten carbide 
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                        Question 77 of 10077. Question77. Which of this carbon compound is not harmful to human? Correct
 Even though carbon and its compounds are vital for modern life, some of its compounds like CO, cyanide and certain types of plastics are harmful to humans. Incorrect
 Even though carbon and its compounds are vital for modern life, some of its compounds like CO, cyanide and certain types of plastics are harmful to humans. 
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                        Question 78 of 10078. Question78. Choose the Incorrect statements. 
 i) Plastics are major class of catenated Inorganic carbon compounds.
 ii) Plastics are made from the long chain compounds called as polymer resins.Correct
 Plastics are a major class of catenated organic carbon compounds. They are made from long chain organic compounds called ‘polymer resins’ with chemical additives that give them different properties. Incorrect
 Plastics are a major class of catenated organic carbon compounds. They are made from long chain organic compounds called ‘polymer resins’ with chemical additives that give them different properties. 
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                        Question 79 of 10079. Question79. Why the plastic materials are recycled? Correct
 Drawbacks of plastics: Plastics take a very long time to fully break down in nature. The microbes that break down plastic are too few in nature to deal with the quantity of plastics we produce. Incorrect
 Drawbacks of plastics: Plastics take a very long time to fully break down in nature. The microbes that break down plastic are too few in nature to deal with the quantity of plastics we produce. 
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                        Question 80 of 10080. Question80. What are the environmental effects of plastic usage? Correct
 A lot of plastic does not get recycled and ends up polluting the environment. Some types of plastics contain harmful chemical additives that are not good for human health. Burning of plastics releases toxic gases that are harmful to our health and contribute to climate change. One-time use and throwaway plastics end up littering and polluting the environment. Incorrect
 A lot of plastic does not get recycled and ends up polluting the environment. Some types of plastics contain harmful chemical additives that are not good for human health. Burning of plastics releases toxic gases that are harmful to our health and contribute to climate change. One-time use and throwaway plastics end up littering and polluting the environment. 
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                        Question 81 of 10081. Question81. Which of these represent the type of polymer used to make the plastic? Correct
 In order to know which plastics are harmful, you will need to learn the secret ‘language’ of plastics (resin codes).The resin code represents the type of polymer used to make the plastic. Incorrect
 In order to know which plastics are harmful, you will need to learn the secret ‘language’ of plastics (resin codes).The resin code represents the type of polymer used to make the plastic. 
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                        Question 82 of 10082. Question82. In which year the resin codes of plastics were designed? Correct
 The resin codes of plastics were designed in 1988 and are a uniform way of classifying the different types of plastic which help recyclers in the sorting process. Incorrect
 The resin codes of plastics were designed in 1988 and are a uniform way of classifying the different types of plastic which help recyclers in the sorting process. 
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                        Question 83 of 10083. Question83. Assertion (A): The Resin codes are represented by three chasing arrows in a triangle with a number or alphabet. 
 Reasoning (R): The number or alphabet represents the recycle level of the plastic.Correct
 The secret resin codes are shown as three chasing arrows in a triangle. There is a number in the middle or letters under the triangle (an acronym of that plastic type). This is usually difficult to find. It can be found on the label or bottom of a plastic item. The resin codes look very similar to the recycling symbol, but this does not mean that all plastics with a code can be recycled. Incorrect
 The secret resin codes are shown as three chasing arrows in a triangle. There is a number in the middle or letters under the triangle (an acronym of that plastic type). This is usually difficult to find. It can be found on the label or bottom of a plastic item. The resin codes look very similar to the recycling symbol, but this does not mean that all plastics with a code can be recycled. 
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                        Question 84 of 10084. Question84. What are the maximum numbers used in resin codes? Correct
 The resin codes are numbered from 1 to 7. Resin codes #1 to #6 each identify a certain type of plastic that is often used in products. Resin code #7 is a category which is used for every other plastic (since 1988) that does not fit into the categories #1 to #6. Incorrect
 The resin codes are numbered from 1 to 7. Resin codes #1 to #6 each identify a certain type of plastic that is often used in products. Resin code #7 is a category which is used for every other plastic (since 1988) that does not fit into the categories #1 to #6. 
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                        Question 85 of 10085. Question85. Choose the Incorrect statements. 
 i) Some type of plastics contains harmful chemicals to human health.
 ii) Plastics are harmful only when they are burned.
 iii) One time use plastics cause pollution to the environment.Correct
 Plastics in our everyday life can be harmful for two reasons. The first reason is that some types of plastic contain chemicals that are harmful to our health. The second reason is that a lot of plastics are designed to be used just for one time. This use and throwaway plastic cause’s pollution to our environment. Incorrect
 Plastics in our everyday life can be harmful for two reasons. The first reason is that some types of plastic contain chemicals that are harmful to our health. The second reason is that a lot of plastics are designed to be used just for one time. This use and throwaway plastic cause’s pollution to our environment. 
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                        Question 86 of 10086. Question86. Match 
 A. PC/ABS i) 6
 B. PVC ii) 7
 C. PS iii) 3Correct
 There are three types of plastic that use toxic and harmful chemicals. These chemicals are added to plastics to give them certain qualities such as flexibility, strength, color and fire or UV resistance. The three unsafe plastics are: PVC (resin code #3), PS (resin code #6 also commonly called Thermocol) and PC/ABS (resin code #7). Incorrect
 There are three types of plastic that use toxic and harmful chemicals. These chemicals are added to plastics to give them certain qualities such as flexibility, strength, color and fire or UV resistance. The three unsafe plastics are: PVC (resin code #3), PS (resin code #6 also commonly called Thermocol) and PC/ABS (resin code #7). 
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                        Question 87 of 10087. Question87. Which is not true regarding the PVC? Correct
 PVC – Polyvinyl Chloride plastics: Phthalates (chemical additive) copy our hormones. Burning PVC releases dioxins (one of the most toxic chemicals known to humans). Incorrect
 PVC – Polyvinyl Chloride plastics: Phthalates (chemical additive) copy our hormones. Burning PVC releases dioxins (one of the most toxic chemicals known to humans). 
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                        Question 88 of 10088. Question88. Which of these metals are not added to PVC plastic? Correct
 Heavy metals like cadmium & lead are added to PVC. Incorrect
 Heavy metals like cadmium & lead are added to PVC. 
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                        Question 89 of 10089. Question89. What is the basis of the PS plastics? Correct
 PS (Polystyrene plastics) Styrene is a building block of this plastic and may cause cancer. Incorrect
 PS (Polystyrene plastics) Styrene is a building block of this plastic and may cause cancer. 
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                        Question 90 of 10090. Question91. What are the disadvantages of PS plastics? Correct
 91. What are the disadvantages of PS plastics? Incorrect
 91. What are the disadvantages of PS plastics? 
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                        Question 91 of 10091. Question92. What does the Polycarbonate plastics contain? Correct
 PC – Polycarbonate plastics: PC plastic contains Bisphenol A (BPA). BPA leaks out of PC products used for food and drinks. Incorrect
 PC – Polycarbonate plastics: PC plastic contains Bisphenol A (BPA). BPA leaks out of PC products used for food and drinks. 
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                        Question 92 of 10092. Question93. What is the effect of BPA of polycarbonate carbonates in the human body? Correct
 BPA increases or decreases certain hormones and changes the way our bodies work. Incorrect
 BPA increases or decreases certain hormones and changes the way our bodies work. 
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                        Question 93 of 10093. Question94. Choose the correct statements regarding ABS plastics. 
 i) The Styrene in ABS damages the human skin, digestive system and lungs.
 ii) Brominated Flame Retardants are added often in ABS.
 iii) Toxic chemicals leak from this type of plastic.Correct
 Explanation 
 ABS – Acrylonitrile Butadiene Styrene
 • Styrene causes problems for our eyes, skin, digestive system and lungs.
 • Brominated Flame Retardants (BFRs) are often added.
 • Studies show that toxic chemicals leak from this plastic.Incorrect
 Explanation 
 ABS – Acrylonitrile Butadiene Styrene
 • Styrene causes problems for our eyes, skin, digestive system and lungs.
 • Brominated Flame Retardants (BFRs) are often added.
 • Studies show that toxic chemicals leak from this plastic.
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                        Question 94 of 10094. Question95. By which year amendment the Government of India took initiatives to stop plastic pollution? Correct
 The Government of India is progressively taking various legal initiatives to stop plastic pollution by making some provisions and amendments in the Environment (Protection) Act, 1988. Incorrect
 The Government of India is progressively taking various legal initiatives to stop plastic pollution by making some provisions and amendments in the Environment (Protection) Act, 1988. 
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                        Question 95 of 10095. Question96. Which of this department of Tamil Nadu government passed the GO to ban the usage of plastic items? Correct
 With reference to this act, Government of Tamil Nadu has taken a step forward to ban the usage of some kind of plastic items (Environment and Forests Department, T.N. G.O. No: 84, dated 25/06/2018). Incorrect
 With reference to this act, Government of Tamil Nadu has taken a step forward to ban the usage of some kind of plastic items (Environment and Forests Department, T.N. G.O. No: 84, dated 25/06/2018). 
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                        Question 96 of 10096. Question97. When the Tamil Nadu Government banned the usage of one-time use and throwaway plastics? Correct
 As per the government order cited above, the Tamil Nadu Government has banned the usage of one-time use and throwaway plastics from 1st January 2019. This excellent legislation is designed to protect Tamil Nadu from plastic pollution. Incorrect
 As per the government order cited above, the Tamil Nadu Government has banned the usage of one-time use and throwaway plastics from 1st January 2019. This excellent legislation is designed to protect Tamil Nadu from plastic pollution. 
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                        Question 97 of 10097. Question98. Which of this item is not banned in Tamil Nadu? Correct
 As per the key aspects of new rules along with science-based facts these items have been banned in Tamil Nadu Plastic carry bags, Plastic plates, Water pouches, Plastic straws and Plastic sheets. Incorrect
 As per the key aspects of new rules along with science-based facts these items have been banned in Tamil Nadu Plastic carry bags, Plastic plates, Water pouches, Plastic straws and Plastic sheets. 
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                        Question 98 of 10098. Question99. By which of these material most of the plastic one-time plates are made? Correct
 Most of the one-time use plates are made from Polystyrene (resin code # 6) which is harmful to our health. Incorrect
 Most of the one-time use plates are made from Polystyrene (resin code # 6) which is harmful to our health. 
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                        Question 99 of 10099. Question100. What are the safety measures for plastic usage in daily life? Correct
 Incorrect
 
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                        Question 100 of 100100. QuestionCarbon disulphide is prepared from _____ and ______. Correct
 Carbon disulphide (CS2) is directly prepared from Carbon and Sulphur. Incorrect
 Carbon disulphide (CS2) is directly prepared from Carbon and Sulphur. 
Leaderboard: Carbon And Its Compounds Online Test 9th Science Lesson 15 Questions in English
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