The method of sieving is used to separate:

Components of same size

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Components of different size

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Soluble impurities

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Liquid impurities

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Solution

The correct option is B
Components of different size

When the components of the mixture are of different sizes, the methods of sieving is used. The small particles pass through the sieve while the bigger particles are left in the sieve.

Suggest Corrections

Separation process	The purpose for which we do the separation	What do we do with the separated components?
(1) Separate stones from rice.	(a) To separate two different but useful components.	(i) We throw away the solid component.
(2) Churning milk to obtain butter.	(b) To remove non-useful components.	(ii) We threw away the impurities.
(3) Separate tea leaves	(c) To remove impurities or harmful components.	(iii) We use both components.