Elements and Compounds around us. - 8th Std Science
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Question 1 |
A pure substance is free from _____
adulteration | |
dut particles |
Question 2 |
_________ is a pure substance.
Sugar | |
Milk |
Question 3 |
A _________ is made up of the same kind of atoms or different kinds of atoms
molecule | |
element |
Question 4 |
________ is an element.
Oxygen | |
Silver bromide |
Question 5 |
Pure water contains hydrogen and oxygen which cannot be separated by _______ methods.
physical | |
chemical |
Question 6 |
______ are made up of one kind of atom only.
molecules | |
elements |
Question 7 |
There are ________ elements known at present.
118 | |
112 |
Question 8 |
On the earth’s crust, ________ is the most abundant element.
Oxygen | |
Nitrogen |
Question 9 |
______ is a liquid element.
Mercury | |
milk |
Question 10 |
_______ show the properties of metals as well as non-metals.
Metals | |
metalloids |
Question 11 |
______ are malleable.
non-metals | |
metals |
Question 12 |
________ are bad conductors of geat and electricity.
Metals | |
non-metals |
Question 13 |
Symbol of neon is ________
N | |
Ne |
Question 14 |
Pb is the symbol of ______
Lead | |
Potassium |
Question 15 |
Molecule of Nitrogen is _______
diatomic | |
mono atomic |
Question 16 |
A molecule of ________ consists of three atoms
Ozone | |
Oxygen |
Question 17 |
Nitrogen is an _______
element | |
a compound |
Question 18 |
Aluminium iodine is _______
reddish brown | |
greyish black |
Question 19 |
Sulphur dioxide has ______ odour.
rotten egg | |
pungent |
Question 20 |
A marble is an ________ compound.
organic | |
inorganic |
Question 21 |
________ is used in fire extinguisher
Baking soda | |
washing soda |
Question 22 |
__________ is used in the preparation of sweets and toffees.
Sugar | |
table salt |
Question 23 |
_________ is the combining capacity of an element.
Formula | |
Valency |
Question 24 |
The valency of Neon is _______
zero | |
eight |
Question 25 |
- Fill in the blanks.
Pure | |
Impure |
Question 26 |
Air we breathe is a _________ of gases.
Solution | |
mixture | |
pure substance |
Question 27 |
__________ is a mixture of liquid fat, protein and water.
Coconut Water | |
Juice | |
milk |
Question 28 |
______ is the smallest particle of an elemet.
atom | |
electron | |
proton |
Question 29 |
Sulphur contains ________atoms only.
Carbonite | |
Corbon | |
Sulphur |
Question 30 |
Atoms of ______ elements are not identical.
different | |
More | |
Same |
Question 31 |
There are ________ elements occur in nature.
86 | |
92 | |
94 |
Question 32 |
Hydrogen and Helium are the main elements in the ______ and _______.
universe, stars | |
Sun, moon | |
Earth, mars |
Question 33 |
Of the 92 natural elements _______ are metals.
65 | |
70 | |
72 |
Question 34 |
Boron is a _____
iron | |
metal | |
metalloid |
Question 35 |
_____ is the symbol of Vanadium.
Ve | |
V | |
k |
Question 36 |
Two or more elements combine in a fixed ratio by mass to form a _______
Substance | |
Mixture | |
compound |
Question 37 |
Sulphur combines with Oxygen to form ________
Copper Sulphite | |
Sulphur dioxide | |
potassium sulphite |
Question 38 |
A compound has a _______ melting and boiling point
unfixed | |
fixed |
Question 39 |
Waxes are ________ compounds.
organic | |
mixed |
Question 40 |
Lime stone is used in the preparation of ______
chalk pieces | |
Gypsum | |
Cake |
Question 41 |
Table salt is an essential component to preserve ______
beef and egg | |
meat and fish |
Question 42 |
_______ is used in the manufacture of cement and glass.
quick lime | |
stone | |
gypsum |
Question 43 |
Elements which do not combine with other elements have _________ valency.
ten | |
zero | |
eight |
Question 44 |
Ag is the symbol of ______
silver | |
potassium | |
sulphur |
Question 45 |
The valency of Argon is _____
ten | |
zero | |
eight |
Question 46 |
Copper is a _______ valency element.
variable | |
mixture | |
substance |
Question 47 |
- Match the following
- Argon a. Sb
- Tin b. Ar
- Antimony c. Hg
- Sodium d. Sn
- Mercury e. Na
3 1 5 2 4 | |
1 5 4 2 3 | |
2 4 5 3 1 | |
4 5 3 2 1 |
Question 48 |
Match the following
- Quick lime a. Sodium Carbonate
- Bleaching powder b. Sucrose
- Washing soda c. NaCl
- Sugar d. Calcium oxychloride
- Table salt e. CaO.
5 4 3 1 2 | |
3 4 5 2 1 | |
1 2 5 4 3 | |
4 3 2 1 5 |
Question 49 |
Match the following
- Element a. Earth’s crust
- Oxygen b. Copper
- Mercury c. metalloid
- Germanium d. pictorial symbols
- Alchemist e. liquid
4 1 2 3 5 | |
2 1 4 5 3 | |
2 3 5 1 4 | |
5 4 3 2 1 |
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There are 49 questions to complete.
