Acids And Bases Online Test 8th Science Lesson 19 Questions in English
Acids And Bases Online Test 8th Science Lesson 19 Questions in English
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Acids And Bases Online Test 8th Science Lesson 19 Questions in English
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Question 1 of 62
1. Question
- The food substances like Tamarind, curd and lemon has a ____ taste and said to be ____ in nature.
Correct
Explanation
In our daily life we come across different food substances. Some substances like fruits, tamarind, graphs, curd and lemon are sour. They are said to be acidic.
Incorrect
Explanation
In our daily life we come across different food substances. Some substances like fruits, tamarind, graphs, curd and lemon are sour. They are said to be acidic.
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Question 2 of 62
2. Question
- Which of these substances are not classified as base?
Correct
Explanation
Some substances like sodium bicarbonate and green tea are bitter in taste. They are said to be basic.
Incorrect
Explanation
Some substances like sodium bicarbonate and green tea are bitter in taste. They are said to be basic.
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Question 3 of 62
3. Question
- Choose the correct statements.
i) Acid and bases are one of the important chemicals used in every field of science and in daily life.
ii) Acid and base does not react with each other.
iii) Aspirin and dietary fats are classified as acids.
iv) All the biological molecules are classified as bases.
v) The chemical compounds in DNA are base.
Correct
Explanation
Acids and bases are one of the important chemical compounds which play a significant role in every field of science. Acids and bases are everywhere right from the soap used for shower to the vinegar present in the kitchen. Acids and bases react with each other and also with water. As a result they are important biologically, industrially and environmentally. For example, among the medicines we use, aspirin is acidic and antacids are basic. Similarly, many biological molecules are also either acids or bases. Dietary fats are acids and the chemical compounds in DNA are bases.
Incorrect
Explanation
Acids and bases are one of the important chemical compounds which play a significant role in every field of science. Acids and bases are everywhere right from the soap used for shower to the vinegar present in the kitchen. Acids and bases react with each other and also with water. As a result they are important biologically, industrially and environmentally. For example, among the medicines we use, aspirin is acidic and antacids are basic. Similarly, many biological molecules are also either acids or bases. Dietary fats are acids and the chemical compounds in DNA are bases.
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Question 4 of 62
4. Question
- Assertion (A): The chemical compounds with sour taste are called acids generally.
Reasoning (R): Acid is the term derived from the Latin word Acidus which means Sour.
Correct
Explanation
The term acid is derived from the Latin word ‘acidus’ which means sour. Thus, the chemical compounds which have sour taste are called acids generally.
Incorrect
Explanation
The term acid is derived from the Latin word ‘acidus’ which means sour. Thus, the chemical compounds which have sour taste are called acids generally.
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Question 5 of 62
5. Question
- Which of these ions are released from the acids when dissolved in water?
Correct
Explanation
All acids contain one or more replaceable hydrogen atoms in their molecules and when dissolved in water they release H+ ions.
Incorrect
Explanation
All acids contain one or more replaceable hydrogen atoms in their molecules and when dissolved in water they release H+ ions.
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Question 6 of 62
6. Question
- Which of the following does not release hydrogen ions when dissolved in water?
Correct
Explanation
Hydrochloric acid (HCl), Sulphuric acid (H2SO4) and Nitric acid (HNO3) release hydrogen ions (H+) when dissolved in water.
Incorrect
Explanation
Hydrochloric acid (HCl), Sulphuric acid (H2SO4) and Nitric acid (HNO3) release hydrogen ions (H+) when dissolved in water.
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Question 7 of 62
7. Question
- According to whose theory the substance which furnishes H+ or H3O+ ions in aqueous solution is acid?
Correct
Explanation
Swedish chemist Svante Arrhenius proposed a theory on acids. According to him, an acid is a substance which furnishes H+ ions or H3O+ ions in aqueous solution.
Incorrect
Explanation
Swedish chemist Svante Arrhenius proposed a theory on acids. According to him, an acid is a substance which furnishes H+ ions or H3O+ ions in aqueous solution.
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Question 8 of 62
8. Question
- On what basis acids are classified into organic and inorganic acids?
Correct
Explanation
Acids are defined as the chemical substances which release hydrogen ions when dissolved in water. Acids can be classified into organic acids and inorganic acids depending on the sources.
Incorrect
Explanation
Acids are defined as the chemical substances which release hydrogen ions when dissolved in water. Acids can be classified into organic acids and inorganic acids depending on the sources.
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Question 9 of 62
9. Question
- Which of the following is not an Organic acid?
Correct
Explanation
Some acids occur naturally in fruits and vegetables. These are called organic acids. Examples: Citric acid, tartaric acid etc.
Incorrect
Explanation
Some acids occur naturally in fruits and vegetables. These are called organic acids. Examples: Citric acid, tartaric acid etc.
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Question 10 of 62
10. Question
- Identify the Incorrect Match.
Tomato i) Malic acid
Milk ii) Oxalic acid
Apple iii) Citric acid
Orange iv) Lactic acid
Correct
Explanation
Organic acids and their sources
Incorrect
Explanation
Organic acids and their sources

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Question 11 of 62
11. Question
- Choose the correct statements.
i) Acids produced artificially in industries are called as Mineral acids or Inorganic acids.
ii) Organic and Inorganic acids are the only classification of acids.
iii) Hydrochloric acid, Sulphuric acid and Nitric acids are Organic acids.
Correct
Explanation
On the other hand, man produces acids artificially in industries. These acids are called mineral acids or inorganic acids. Examples: Hydrochloric acid (HCl), Sulphuric acid (H2SO4), Nitric acid (HNO3) etc., There are many more classifications of acids.
Incorrect
Explanation
On the other hand, man produces acids artificially in industries. These acids are called mineral acids or inorganic acids. Examples: Hydrochloric acid (HCl), Sulphuric acid (H2SO4), Nitric acid (HNO3) etc., There are many more classifications of acids.
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Question 12 of 62
12. Question
- Which of the following property is not suitable for an acid?
Correct
Explanation
Physical properties of Acids: Acids are sour in taste, they are corrosive in nature. Acids are colorless. They are soluble in water.
Incorrect
Explanation
Physical properties of Acids: Acids are sour in taste, they are corrosive in nature. Acids are colorless. They are soluble in water.
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Question 13 of 62
13. Question
- Choose the correct statements.
i) The solutions of acids conduct electricity.
ii) All acids will spoil the substances like clothes, paper and human skin.
Correct
Explanation
Strong acids can spoil substances like human skin, clothes and paper. Solutions of acids conduct electricity.
Incorrect
Explanation
Strong acids can spoil substances like human skin, clothes and paper. Solutions of acids conduct electricity.
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Question 14 of 62
14. Question
- Which of these acids exist in solid state?
Correct
Explanation
Generally acids exist in liquid state but few acids exist in solid state too. E.g. Benzoic acid
Incorrect
Explanation
Generally acids exist in liquid state but few acids exist in solid state too. E.g. Benzoic acid
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Question 15 of 62
15. Question
- Which of these is changed to pink color if treated with acids?
Correct
Explanation
Acids change the color of the indicators. Blue litmus paper turns red and methyl orange turns pink when treated with acids.
Incorrect
Explanation
Acids change the color of the indicators. Blue litmus paper turns red and methyl orange turns pink when treated with acids.
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Question 16 of 62
16. Question
- Which of this gas is released in the acid-metal reaction?
Correct
Explanation
Metals like zinc, magnesium, aluminum, iron etc., react with acids like hydrochloric acid, Sulphuric acid to form metal salts and release hydrogen gas.
Metal + Dilute acids → Metal salt + Hydrogen
Incorrect
Explanation
Metals like zinc, magnesium, aluminum, iron etc., react with acids like hydrochloric acid, Sulphuric acid to form metal salts and release hydrogen gas.
Metal + Dilute acids → Metal salt + Hydrogen
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Question 17 of 62
17. Question
- Choose the Incorrect statements.
i) All the cooking vessels are coated with tin metal.
ii) Metal coating prevents the chemical reaction of the organic acids of food materials with the vessel materials.
iii) Tin isolates the vessels from the acid reaction and prevents food poisoning.
Correct
Explanation
Copper or brass cooking vessels are coated with tin metal (eyam). If it is not coated the organic acids present in the food materials will react with copper and make the food poisonous. The tin isolates the vessel from the action of acids and prevents food poisoning.
Incorrect
Explanation
Copper or brass cooking vessels are coated with tin metal (eyam). If it is not coated the organic acids present in the food materials will react with copper and make the food poisonous. The tin isolates the vessel from the action of acids and prevents food poisoning.
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Question 18 of 62
18. Question
- Which of these results in the reaction of limestone and Sulphuric acid?
Correct
Explanation
When carbonates and bicarbonates come into contact with dilute acids carbon dioxide is given out along with water. For example limestone (calcium carbonate) reacts with dilute Sulphuric acid to form calcium sulphate, carbon dioxide and water.
Calcium carbonate + dil Sulphuric acid → Calcium sulphate + Carbon dioxide + Water
CaCO3 + H2SO4 → CaSO4 + CO2 + H2O
Incorrect
Explanation
When carbonates and bicarbonates come into contact with dilute acids carbon dioxide is given out along with water. For example limestone (calcium carbonate) reacts with dilute Sulphuric acid to form calcium sulphate, carbon dioxide and water.
Calcium carbonate + dil Sulphuric acid → Calcium sulphate + Carbon dioxide + Water
CaCO3 + H2SO4 → CaSO4 + CO2 + H2O
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Question 19 of 62
19. Question
- Which of these reacts with acids and produce metal salts and water?
Correct
Explanation
Oxides of various metals react with dilute acids to form their metallic salts and water.
Metal oxides + dilute Acid → Metal salts + Water
Incorrect
Explanation
Oxides of various metals react with dilute acids to form their metallic salts and water.
Metal oxides + dilute Acid → Metal salts + Water
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Question 20 of 62
20. Question
- Match
Fatty acids i) Food digestion in stomach
Acetic acid ii) Pickles
Hydrochloric acid iii) Preserve food materials
Benzoic acid iv) Soaps
Correct
Explanation
Uses of Acids
- Hydrochloric acid present in our stomach helps in the digestion of foodstuff.
- Vinegar (acetic acid) is used to preserve food materials.
- Benzoic acid is also used to preserve food materials like pickles.
- Sodium or potassium salts of higher fatty acids are used to make washing and bathing soaps.
Incorrect
Explanation
Uses of Acids
- Hydrochloric acid present in our stomach helps in the digestion of foodstuff.
- Vinegar (acetic acid) is used to preserve food materials.
- Benzoic acid is also used to preserve food materials like pickles.
- Sodium or potassium salts of higher fatty acids are used to make washing and bathing soaps.
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Question 21 of 62
21. Question
- Which of the following acid is called as the king of chemicals?
Correct
Explanation
Sulphuric acid is called the king of chemicals. It is used in various industries to make detergents, paints, fertilizers and many more chemicals.
Incorrect
Explanation
Sulphuric acid is called the king of chemicals. It is used in various industries to make detergents, paints, fertilizers and many more chemicals.
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Question 22 of 62
22. Question
- What is the usage of the Sulphuric acid?
Correct
Explanation
Sulphuric acid is an effective dehydrating agent. It is used in various industries to make detergents, paints, fertilizers and many more chemicals.
Incorrect
Explanation
Sulphuric acid is an effective dehydrating agent. It is used in various industries to make detergents, paints, fertilizers and many more chemicals.
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Question 23 of 62
23. Question
- Which of the following is not a laboratory reagent?
Correct
Explanation
Hydrochloric acid, Nitric acid and Sulphuric acid are important laboratory reagents.
Incorrect
Explanation
Hydrochloric acid, Nitric acid and Sulphuric acid are important laboratory reagents.
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Question 24 of 62
24. Question
- Assertion (A): Cells of all the living organisms contains the fundamental nuclear material called as nucleic acids.
Reasoning (R): Animals have deoxy ribonucleic acid and plants contain ribonucleic acids.
Correct
Explanation
Cells of all living organisms contain the fundamental nuclear material called nucleic acids. Animals have deoxy ribonucleic acid (DNA) whereas plants contain ribonucleic acid (RNA).
Incorrect
Explanation
Cells of all living organisms contain the fundamental nuclear material called nucleic acids. Animals have deoxy ribonucleic acid (DNA) whereas plants contain ribonucleic acid (RNA).
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Question 25 of 62
25. Question
- Which of the following is used to maintain pickles in good condition for a long time?
Correct
Explanation
Pickles remain in good condition for long time because they contain vinegar (acetic acid) or benzoic acid.
Incorrect
Explanation
Pickles remain in good condition for long time because they contain vinegar (acetic acid) or benzoic acid.
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Question 26 of 62
26. Question
- Assertion (A): Most of the soaps, detergents, toothpastes are the examples of base.
Reasoning (R): The slippery texture of the soaps is due to the presence of base.
Correct
Explanation
Soaps are slippery due to the presence of ‘base’. Bases are chemical substances that are corrosive and bitter in taste. A lot of bleaches, soaps, detergents, kinds of toothpaste, etc., are bases. In contrast to acids which release hydrogen ions in water, bases release hydroxide ions in water.
Incorrect
Explanation
Soaps are slippery due to the presence of ‘base’. Bases are chemical substances that are corrosive and bitter in taste. A lot of bleaches, soaps, detergents, kinds of toothpaste, etc., are bases. In contrast to acids which release hydrogen ions in water, bases release hydroxide ions in water.
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Question 27 of 62
27. Question
- Choose the correct statements.
i) Base is a chemical substance that releases hydroxide ions when dissolved in water.
ii) All the soluble bases are called as alkalis.
Correct
Explanation
The chemical substances that release hydroxide ions when dissolved in water are called as bases. Examples: Sodium hydroxide (NaOH) and Potassium hydroxide (KOH).
Sodium hydroxide → Sodium ion + Hydroxide ion
NaOH → Na+ + OH–
Incorrect
Explanation
The chemical substances that release hydroxide ions when dissolved in water are called as bases. Examples: Sodium hydroxide (NaOH) and Potassium hydroxide (KOH).
Sodium hydroxide → Sodium ion + Hydroxide ion
NaOH → Na+ + OH–
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Question 28 of 62
28. Question
- Which of the following is not an alkali?
Correct
Explanation
Water soluble bases are called Alkalis. Bases like sodium hydroxide, potassium hydroxide, calcium hydroxide and ammonium hydroxide are highly soluble in water and hence they are called alkalis.
Incorrect
Explanation
Water soluble bases are called Alkalis. Bases like sodium hydroxide, potassium hydroxide, calcium hydroxide and ammonium hydroxide are highly soluble in water and hence they are called alkalis.
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Question 29 of 62
29. Question
- Which of the following base does not release hydroxide ions if dissolved in water?
Correct
Explanation
Certain chemical substances which do not release hydroxide ions when dissolved in water also behave as bases. Examples: Sodium carbonate, Sodium bicarbonate, Calcium carbonate etc.
Incorrect
Explanation
Certain chemical substances which do not release hydroxide ions when dissolved in water also behave as bases. Examples: Sodium carbonate, Sodium bicarbonate, Calcium carbonate etc.
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Question 30 of 62
30. Question
- Match.
Magnesia milk i) Calcium hydroxide
Detergent ii) Magnesium hydroxide
Lime water iii) Ammonium hydroxide
Window cleaning solution iv) Sodium hydroxide
Correct
Explanation
Common bases in some products
Incorrect
Explanation
Common bases in some products

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Question 31 of 62
31. Question
- Identify the incorrect match.
Caustic potash i) Ammonium hydroxide
Sodium bicarbonate ii) Baking soda
Sodium hydroxide iii) Caustic soda
Sodium carbonate iv) Washing soda
Correct
Explanation
Sodium carbonate (Na2CO3) is commercially called washing soda. Similarly sodium bicarbonate (NaHCO3) is commercially called baking soda. Caustic soda is sodium hydroxide (NaOH) and caustic potash is potassium hydroxide (KOH).
Incorrect
Explanation
Sodium carbonate (Na2CO3) is commercially called washing soda. Similarly sodium bicarbonate (NaHCO3) is commercially called baking soda. Caustic soda is sodium hydroxide (NaOH) and caustic potash is potassium hydroxide (KOH).
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Question 32 of 62
32. Question
- Which of the following base exist in liquid state?
Correct
Explanation
Properties of Bases: Bases generally exist in solid state but some bases exist in liquid state also. E.g. Ammonium hydroxide, calcium hydroxide
Incorrect
Explanation
Properties of Bases: Bases generally exist in solid state but some bases exist in liquid state also. E.g. Ammonium hydroxide, calcium hydroxide
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Question 33 of 62
33. Question
- Which of the following is physical property of a base?
i) Base gives soapy touch in all medium.
ii) Bases are corrosive in nature.
iii) Bases are colorless.
iv) Bases are bitter in taste.
Correct
Explanation
Physical properties of Base: Bases give soapy touch only in aqueous media not in dry nature. Bases are bitter in taste. Bases are corrosive in nature. When come in contact with the skin frequently they form painful blisters. Bases are generally colorless. Bases also conduct electricity in aqueous solution.
Incorrect
Explanation
Physical properties of Base: Bases give soapy touch only in aqueous media not in dry nature. Bases are bitter in taste. Bases are corrosive in nature. When come in contact with the skin frequently they form painful blisters. Bases are generally colorless. Bases also conduct electricity in aqueous solution.
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Question 34 of 62
34. Question
- Match the color indicators of the base.
Methyl orange i) Blue
Red litmus ii) Pink
Phenolphthalein iii) Yellow
Correct
Explanation
Bases also change the color of the indicators. Red litmus paper turns blue when treated with bases. Similarly, they turn methyl orange yellow and phenolphthalein pink.
Incorrect
Explanation
Bases also change the color of the indicators. Red litmus paper turns blue when treated with bases. Similarly, they turn methyl orange yellow and phenolphthalein pink.
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Question 35 of 62
35. Question
- Assertion (A): In general all the existing metals react with a base.
Reasoning (R): A metallic oxide does not react with base.
Correct
Explanation
Reaction with metals: Generally metals do not react with bases. All bases react with non- metallic oxides to form salt and water.
Incorrect
Explanation
Reaction with metals: Generally metals do not react with bases. All bases react with non- metallic oxides to form salt and water.
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Question 36 of 62
36. Question
- Which of the following metal react with base and release hydrogen?
Correct
Explanation
Reaction with metals: Generally metals do not react with bases. Metals like Aluminium and Zinc react with bases like sodium hydroxide forming aluminates and release hydrogen.
Aluminum + Sodium hydroxide + Water → Sodium aluminate + Hydrogen
2Al + 2NaOH + 2H2O → 2NaAlO2+ 3H2
Incorrect
Explanation
Reaction with metals: Generally metals do not react with bases. Metals like Aluminium and Zinc react with bases like sodium hydroxide forming aluminates and release hydrogen.
Aluminum + Sodium hydroxide + Water → Sodium aluminate + Hydrogen
2Al + 2NaOH + 2H2O → 2NaAlO2+ 3H2
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Question 37 of 62
37. Question
- Which of these reacts with base and results with salt and water?
Correct
Explanation
Reaction with metal oxides: All bases react with non-metallic oxides to form salt and water. For example sodium hydroxide reacts with carbon dioxide to form sodium carbonate.
Sodium hydroxide + Carbon dioxide → Sodium carbonate + Water
2NaOH + CO2 → Na2CO3 + H2O
Incorrect
Explanation
Reaction with metal oxides: All bases react with non-metallic oxides to form salt and water. For example sodium hydroxide reacts with carbon dioxide to form sodium carbonate.
Sodium hydroxide + Carbon dioxide → Sodium carbonate + Water
2NaOH + CO2 → Na2CO3 + H2O
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Question 38 of 62
38. Question
- Which of these does not results in from the reaction of base with ammonium salts?
Correct
Explanation
Bases react with ammonium salts to form metal salts, ammonia gas and water.
Sodium hydroxide + Ammonium chloride → Sodium chloride + Ammonia + Water
NH4Cl + NaOH → NaCl + NH3 + H2O
Incorrect
Explanation
Bases react with ammonium salts to form metal salts, ammonia gas and water.
Sodium hydroxide + Ammonium chloride → Sodium chloride + Ammonia + Water
NH4Cl + NaOH → NaCl + NH3 + H2O
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Question 39 of 62
39. Question
- Which is not a common property of an acid and base?
Correct
Explanation
Though acids and bases have some unique properties there are certain similarities between them. Some of them are given below.
- They are corrosive in nature.
- They undergo ionization in aqueous solution.
- They conduct electricity in aqueous solution.
- They undergo neutralization reaction
Incorrect
Explanation
Though acids and bases have some unique properties there are certain similarities between them. Some of them are given below.
- They are corrosive in nature.
- They undergo ionization in aqueous solution.
- They conduct electricity in aqueous solution.
- They undergo neutralization reaction
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Question 40 of 62
40. Question
- Choose the correct statements.
i) Acids are sour in taste and produce H+ ions in water.
ii) Base turns red litmus paper to green color.
iii) Most of the base is in liquid state.
iv) Very few acids are in solid state.
Correct
Explanation
Difference between acids and bases
Incorrect
Explanation
Difference between acids and bases

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Question 41 of 62
41. Question
- Which of the following statements is not true?
Correct
Explanation
Uses of Bases: Potassium hydroxide is used to make bathing soaps. Sodium hydroxide is used to make washing soaps. Sodium hydroxide is also used in paper industries, textile industries and in the preparation of medicines. Calcium hydroxide is used for white washing.
Incorrect
Explanation
Uses of Bases: Potassium hydroxide is used to make bathing soaps. Sodium hydroxide is used to make washing soaps. Sodium hydroxide is also used in paper industries, textile industries and in the preparation of medicines. Calcium hydroxide is used for white washing.
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Question 42 of 62
42. Question
- What is used in antacids?
Correct
Explanation
Aluminum hydroxide and magnesium hydroxides are used in antacids to cure acidity problems.
Incorrect
Explanation
Aluminum hydroxide and magnesium hydroxides are used in antacids to cure acidity problems.
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Question 43 of 62
43. Question
- Which of these are manufactured by using the ammonium hydroxide?
Correct
Explanation
Ammonium hydroxide is used to manufacture fertilizers, nylon, plastics and rubber.
Incorrect
Explanation
Ammonium hydroxide is used to manufacture fertilizers, nylon, plastics and rubber.
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Question 44 of 62
44. Question
- Which of these results in from the neutralization reaction of acid and base?
Correct
Explanation
When neutrality is achieved between two different chemical substances with different chemical properties through a reaction then it is called neutralization in chemistry. Thus neutralization is a chemical reaction in which an acid and a base react with each other to form salt and water. Neutralization reaction between an acid and a base can be written as: Acid + Base → Salt + Water
Incorrect
Explanation
When neutrality is achieved between two different chemical substances with different chemical properties through a reaction then it is called neutralization in chemistry. Thus neutralization is a chemical reaction in which an acid and a base react with each other to form salt and water. Neutralization reaction between an acid and a base can be written as: Acid + Base → Salt + Water
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Question 45 of 62
45. Question
- Which of this salt is produced by the neutralization reaction of Nitric acid and Sodium hydroxide?
Correct
Incorrect
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Question 46 of 62
46. Question
- Which of this acid reacts with sodium hydroxide to produce Sodium sulphate?
Correct
Explanation
Salts produced by neutralization
Incorrect
Explanation
Salts produced by neutralization

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Question 47 of 62
47. Question
- Assertion (A): An Ant bite injects formic acid causing burning sensation and pain.
Reasoning (R): Calcium hydroxide is applied to neutralize the effects of formic acid.
Correct
Explanation
Ant bite: Whenever bees or red ants bite they inject an acid called formic acid. These acids cause burning sensation and pain. To suppress the pain a suitable base in the form of calcium hydroxide (readily available at home) is applied so as to neutralize the formic acid.
Incorrect
Explanation
Ant bite: Whenever bees or red ants bite they inject an acid called formic acid. These acids cause burning sensation and pain. To suppress the pain a suitable base in the form of calcium hydroxide (readily available at home) is applied so as to neutralize the formic acid.
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Question 48 of 62
48. Question
- Which of the following neutralizes the alkalinity of wasp bite?
Correct
Explanation
When we are bitten by wasp, we feel the burning sensation and pain. It is due to an alkaline substance injected by the insect. To neutralize the alkalinity we use vinegar which is an acid.
Incorrect
Explanation
When we are bitten by wasp, we feel the burning sensation and pain. It is due to an alkaline substance injected by the insect. To neutralize the alkalinity we use vinegar which is an acid.
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Question 49 of 62
49. Question
- The Tooth powder and pastes contains _____ to neutralize the ____ effects of tooth decay.
Correct
Explanation
Generally it is advised by the doctors that we should brush our teeth twice a day. This is because the bacteria present in our mouth decompose the food particles stuck in the gaps between our teeth thereby causing acid formation which leads to tooth decay. To prevent this we have to neutralize the acid. When we brush with tooth powder or tooth paste containing weak bases the acid gets neutralized. So our teeth will be strong and healthy.
Incorrect
Explanation
Generally it is advised by the doctors that we should brush our teeth twice a day. This is because the bacteria present in our mouth decompose the food particles stuck in the gaps between our teeth thereby causing acid formation which leads to tooth decay. To prevent this we have to neutralize the acid. When we brush with tooth powder or tooth paste containing weak bases the acid gets neutralized. So our teeth will be strong and healthy.
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Question 50 of 62
50. Question
- Choose the correct statements.
- i) Hydrochloric acid present in human stomach helps to digest the food materials using the enzymes.
- ii) Excessive hydrochloric acid in stomach results in burning sensation in food pipes and ulcer.
iii) Aluminium and magnesium hydroxides are weak bases used to reduce the acidic effects of stomach.
Correct
Explanation
As we know, hydrochloric acid present in our stomach helps the digestion of food material along with the enzymes secreted by liver, gallbladder and pancreases. Sometimes due to excessive production of hydrochloric acid in our stomach we feel burning sensation in food pipe and in chest area. If this happens again and again ulcer will be formed in stomach and food pipe, which further aggravates the conditions. In order to neutralize, antacids which are nothing but weak bases like aluminum and magnesium hydroxides are used. As a result the acidity is removed.
Incorrect
Explanation
As we know, hydrochloric acid present in our stomach helps the digestion of food material along with the enzymes secreted by liver, gallbladder and pancreases. Sometimes due to excessive production of hydrochloric acid in our stomach we feel burning sensation in food pipe and in chest area. If this happens again and again ulcer will be formed in stomach and food pipe, which further aggravates the conditions. In order to neutralize, antacids which are nothing but weak bases like aluminum and magnesium hydroxides are used. As a result the acidity is removed.
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Question 51 of 62
51. Question
- Which of these are added to neutralize the effects of acidic effluents from the industries?
Correct
Explanation
Effluents from the industries contain acids such as Sulphuric acid. It is treated by adding lime to neutralize it before it is discharged into rivers and streams. Power stations treat this acidic gas using powdered lime (CaO) or limestone (CaCO3) to neutralize it so that air pollutant can be prevented.
Incorrect
Explanation
Effluents from the industries contain acids such as Sulphuric acid. It is treated by adding lime to neutralize it before it is discharged into rivers and streams. Power stations treat this acidic gas using powdered lime (CaO) or limestone (CaCO3) to neutralize it so that air pollutant can be prevented.
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Question 52 of 62
52. Question
- Which of this gas is released while burning the fossil fuels?
Correct
Explanation
In power stations fossil fuels such as coal are burnt to produce electricity. Burning fossil fuels will liberate sulphur dioxide gas as an acidic pollutant in the air.
Incorrect
Explanation
In power stations fossil fuels such as coal are burnt to produce electricity. Burning fossil fuels will liberate sulphur dioxide gas as an acidic pollutant in the air.
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Question 53 of 62
53. Question
- Assertion (A): Acid-base indicator is a chemical substance that shows the acidic or basic nature of a solution.
Reasoning (R): Indicators may be natural or synthetic based on the source.
Correct
Explanation
An indicator or acid–base indicator is a chemical substance which indicates the acidic or basic nature of a solution by suitable color change. These may be natural or synthetic.
Incorrect
Explanation
An indicator or acid–base indicator is a chemical substance which indicates the acidic or basic nature of a solution by suitable color change. These may be natural or synthetic.
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Question 54 of 62
54. Question
- Assertion (A): Acid-base indicator is a chemical substance that shows the acidic or basic nature of a solution.
Reasoning (R): Indicators may be natural or synthetic based on the source.
Correct
Explanation
An indicator or acid–base indicator is a chemical substance which indicates the acidic or basic nature of a solution by suitable color change. These may be natural or synthetic.
Incorrect
Explanation
An indicator or acid–base indicator is a chemical substance which indicates the acidic or basic nature of a solution by suitable color change. These may be natural or synthetic.
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Question 55 of 62
55. Question
- Which of the following is not a natural indicator?
Correct
Explanation
Natural indicators are chemical substances which are obtained from the natural resources. Litmus, turmeric juice, China rose petals, red cabbage, grape juice and beetroot juice are the indicators obtained from natural resources.
Incorrect
Explanation
Natural indicators are chemical substances which are obtained from the natural resources. Litmus, turmeric juice, China rose petals, red cabbage, grape juice and beetroot juice are the indicators obtained from natural resources.
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Question 56 of 62
56. Question
- Which of these indicator changes to red color in basic solution?
Correct
Explanation
Turmeric indicator: By adding small amount of water to turmeric powder a paste is prepared. This is applied on a blotting paper or filter paper and dried. These strips are used as indicators to find the nature of the solution. In acidic solution turmeric indicator paper has no change in color. That means it remains yellow. In basic solution the color changes from yellow to red.
Incorrect
Explanation
Turmeric indicator: By adding small amount of water to turmeric powder a paste is prepared. This is applied on a blotting paper or filter paper and dried. These strips are used as indicators to find the nature of the solution. In acidic solution turmeric indicator paper has no change in color. That means it remains yellow. In basic solution the color changes from yellow to red.
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Question 57 of 62
57. Question
- Which of these color results when subjecting the hibiscus flower solution to a basic solution?
Correct
Explanation
Some hibiscus flowers soaked in warm water for about 5 to 10 minutes forms a solution. This solution can be used as indicator. In acidic solution, the color will be changed to deep pink or deep red. In basic solution the color will be changed into a green.
Incorrect
Explanation
Some hibiscus flowers soaked in warm water for about 5 to 10 minutes forms a solution. This solution can be used as indicator. In acidic solution, the color will be changed to deep pink or deep red. In basic solution the color will be changed into a green.
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Question 58 of 62
58. Question
- Choose the correct statements.
- i) Synthetic indicators are prepared from artificial substances.
- ii) Phenolphthalein and methyl orange are the examples of synthetic indicators.
Correct
Explanation
An indicator prepared from artificial substances is known as synthetic indicators. Phenolphthalein and methyl orange are the examples for synthetic indicators.
Incorrect
Explanation
An indicator prepared from artificial substances is known as synthetic indicators. Phenolphthalein and methyl orange are the examples for synthetic indicators.
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Question 59 of 62
59. Question
- Choose the correct statements.
i) Phenolphthalein is a colorless compound.
ii) Phenolphthalein is mixed with hot water and used as an indicator.
Correct
Explanation
Phenolphthalein is a colorless compound. Its alcoholic solution is used as an indicator. It is colorless in acidic solution but turns pink in basic solution.
Incorrect
Explanation
Phenolphthalein is a colorless compound. Its alcoholic solution is used as an indicator. It is colorless in acidic solution but turns pink in basic solution.
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Question 60 of 62
60. Question
- Choose the Incorrect statements.
i) Solid Methyl Orange is directly used as an indicator.
ii) Methyl orange turns to red color in acidic solution.
iii) A basic solution changes the color of methyl orange to yellow color.
Correct
Explanation
Solid methyl orange is dissolved in hot water and its filtrate is used as an indicator. It turns red in acidic solution and yellow in basic solution.
Incorrect
Explanation
Solid methyl orange is dissolved in hot water and its filtrate is used as an indicator. It turns red in acidic solution and yellow in basic solution.
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Question 61 of 62
61. Question
- Match the Indicators color change in Basic solution.
Phenolphthalein i) No change
Blue Litmus ii) Blue
Methyl Orange iii) Pink
Red Litmus iv) Yellow
Correct
Incorrect
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Question 62 of 62
62. Question
- Which of these does not change in color in an acidic solution?
Correct
Explanation
Color Changing Indicators
Incorrect
Explanation
Color Changing Indicators

Leaderboard: Acids And Bases Online Test 8th Science Lesson 19 Questions in English
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