The need for handpicking stones from rice is to remove the unwanted impurities.

To add impurities

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To clean the rice

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Solution

The correct option is A
To add impurities

The stones present in rice can be easily identified due to their size and colour. Hence, handpicking is the most suitable method. After handpicking stones from rice, the stones are not used in any way. They are impurities and hence are discarded.

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Similar questions

Handpicking stones from rice is a process of __________.

Why do we separate substances present in a mixture?
i) To separate wanted components from unwanted components.
ii) To remove impurities.

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.

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