Question

Match the following:
A
1. Sodium chloride
2. Milk
3. Air

B
a) Impure substance
b) Suspension solution
c) Pure substance
d) Mixture

Answer 1

Air ====Mixture

Milk====Suspension solution

Sodium chloride===pure substance

Answer 2

1. Sodium chloride – c) Pure substance

2. Milk – b) Suspension solution

3. Air – d) Mixture

Explanation:  

• A pure substance is either an element or a compound that contain different molecules of same or different substances in a constant ratio. Hence sodium chloride is a pure substance.  

• Similarly air is a mixture of 78 percent of nitrogen 21 percentage of oxygen and other gases. The percentage varies from place to place hence this is a mixture.  

• Similarly milk is an emulsion since the properties of milk is that it has bigger constituents of the material. Also milk has fat, protein and other minerals dissolved in it which may vary.