Question

1. Which of the following is a pure substance?
a. soil
b. air
c. water
d. milk
2. Which of the following is a mixture?
a. common salt
b. sea water
c. carbon dioxide d. sulphur
3. Which of the following is not a mixture?
a. cough syrup
b. muddy water
c. petrol
d. iron sulphide
4. Which of the following is a correct statement for a compound?
a. A compound has a definite composition.
b. A compound is an impure substance.
c. A compound has variable composition.
d. A compound does not have fixed melting and boiling points.
5. What is the settling down of the insoluble heavy solid particles in a solid-liquid mixture at the
bottom of the container called?
a. decantation
b. sieving
c. sedimentation
6. By which of the following methods can common salt be obtained from sea water?
a. filtration
b. sublimation
c. handpicking
d. winnowing
d. evaporation

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Answer 1

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1. Water

2. Sea Water

3. Iron Sulphide

4. A compound has a definite composition.

5. decantation

6. Evaporation

Answer 2

Answer:

1 c

2 d

3 c

4 b

5 c

6 a

Explanation:

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