Question

You have a mixture of rice grains, sand, salt and water. (4)

(a) Can one method be used to separate all different components of this mixture? Why?

(b) In correct sequence/ order of separation (the way you will start separating the components) write the methods (names) in steps. : If the sequence/ order of techniques of separation is incorrect, your answer will be considered wrong)​

Answer 1

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.