Question

LWhich of the following is a pure substance?

soil

air

water

milk

2. Which of the following is a mixture?


sea water

common salt

carbon dioxide

sulphur

3 Which of the following is not a mixture?

muddy water

petrol

iron sulphide

cough syrup

4. Which of the following is a correct statement for a compound?

A compound has a definite composition.

A compound is an impure substance.

A compound has variable composition.

A compound does not have fixed melting and boiling points.

What is the settling down of the insoluble heavy solid particles in a solid-liquid mixture at the bottom of the container called?

decantation

sieving

sedimentation

winnowing

water?

6. By which of the following methods can common salt be obtained from sea

filtration

sublimation

handpicking

evaporation

​

Answer 1

Answer:

2b

3b

4a

5c

6d

Explanation:

Answer 2

Answer:

air

carbon dioxide

petrol

1.

6. (4)