Question

In which of the following mixtures hand picking method can be used for?
a.) The mixture of gas and liquid
b.) The mixture of liquid and liquid
c.) The mixture of solid and liquid
d.) The mixture of solid and solid

Answer 1

Hint: In our daily lives we come across many situations in which we have to separate some substances from a mixture in order to get a suitable substance for use. Some of the substances are easily separable just by taking out with hand. This method of separation is known as handpicking.

Complete step by step answer:
Let us know a bit more about the handpicking method!
It is one of the various methods which are carried out in dry conditions. The substances which are separated with the help of this method can be useful products or other impurities which need to be removed or both the substances which are separated can be useful products.

The substances in the handpicking method can be separated on the basis of size, color, shape, weight etc. For example, separating rotten vegetables from basket of vegetables, separating red gram from rice, separating green grapes from black grapes etc.,

Let us see a few advantages and disadvantages of handpicking.

Advantages:
This method doesn’t need any special machinery for the separation of substance.
It takes less time when used for a small quantity.

Disadvantages:
It is not feasible for large quantities of substances.
It is only possible when substances are visibly different in size.

Hence, hand picking method can be used for the mixture of solid and solid. Therefore, option D is the required answer.

Note: Apart from handpicking methods other methods are sedimentation, Decantation and Filtration. Sometimes, it may not be possible to separate components of a mixture by winnowing and handpicking. For example, there may be lighter impurities like dust or spoil particles in rice or pulses.