Question

Which of the following methods does not require air for separating a solid-solid mixture?

X – Winnowing

Y – Threshing

Z – Handpicking

Answer 1

Answer:

SEPARATION OF TWO SOLIDS WITH THE HELP OF SOLVENT AND FILTRATION - DEFINITION

1. One of the two solids,let's say common salt, should dissolve in water (liquid) and the other (e.g. iron) should not.

2. The soluble solid (common salt) is then filtered out and then the liquid is evaporated to leave behind the solid (common salt).

3.The second one which is not soluble is obtain directly.

SEPARATION METHODS - DEFINITION

1) Handpicking : The method in which substances in a mixture can be separated by just picking them out with the help of hand from the mixture is known as handpicking method.

2) Threshing : Threshing is the process of loosening the edible part of cereal grain (or other crop) from the scaly, inedible chaff that surrounds it.

3) Winnowing : Winnowing is an agricultural method developed by ancient cultures for separating grain from chaff.

4) Sieving : The method of separation of particles from a mixture based on difference in size of particles is known as sieving

Answer 2

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Z – Handpicking