Question

Why is the method of hand picking not used for separating all types of mixture

Answer 1

Answer:

To separate sand and salt, we dissolve the mixture in water and then filter it. In this way salt get dissolved in water while sand we get as residue. Thus, we can say handpicking is used for separating slightly larger sized impurities such as pieces of dirt, stones, husk from wheat, rice, pulses etc.

Answer 2

Answer:

We can't separate all heterogeneous mixtures by handpicking. It is a very time taking process if quantity of the mixture is large.