Classify the following as a solution, suspension or colloid (a) Brine

(b) milk

(c) sand and water

(d) soda

(e) air

(f) smoke

(g) chalk and water

Solution - (a) Brine . Suspension - (c) sand and water, (g) chalk and water Colloid - (e) air,  (f) smoke , (d) soda , (b) milk

Explanation:

A solution is an homogeneous mixture of two or more compounds.

A suspension is a heterogeneous mixture of two or more compounds while a colloid is a homogeneous mixture of two or more compounds with suspended particles which do not settle.

So, under these definitions, the classifications are as follows-

Solution - (a) Brine .

Suspension - (c) sand and water, (g) chalk and water

Colloid - (e) air,  (f) smoke , (d) soda , (b) milk