Q.

Hand picking is used to separate


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a

Stones from rice

b

Salt from water

c

Chaff from the grains

d

All of these 

answer is A.

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Detailed Solution

Hand picking is used to separate stones from rice.
Hand-picking is the process in which unwanted particles or impurities can be removed from a mixture using hands. This method is convenient for a mixture where two solids are mixed. This method is effective when the impurities are larger and visible to our eye. For example, separating stones and husk from rice.
 
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Hand picking is used to separate