Question

1.Husk and chalk particles can be separated by sieving whereas flour and chalk
particles cannot be separated by sieving. Write reason for the same.

Answer 1

Answer:

hope it helps you

please mark as brain list

Explanation:

(i) Mixture of sand and husk: Sand and husk can be separated by the method of winnowing.

(ii) Mixture of wheat, sugar and silk: For separating silk from the mixture we should follow the winnowing method because silk is lighter than other two components and get separated. Wheat and sugar can be separated by sieving because they are in different sizes.

(iii) Mixture of water and petrol: Water does not dissolve in petrol. So, it can be separated by the use of separating funnel.

(iv) Mixture of rice and salt: Rice and salt can be separated by sieving.

(v) Mixture of sand and salt: Sand and salt is mixed with water, salt dissolves in water and sand can be separated solution by sedimentation and decantation followed by filtration. After that using evaporation common salt is separated.

Answer 2

Explanation:

Husk and chalk particles can be separated with sieving as husk particles are larger  and  the chalk powder is lighter than the husk particles so the chalk powder will be filtered.

but flour and chalk cannot be separated as both components are of same size and sieving means to separate components of different sizes.