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Q.

Assertion (A): Metals of high purity are obtained by zone refining. 

Reason (R): Impurities are more soluble in the melt than in pure metal.

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a

Both A and R are true and Ri s the correct explanation of A

b

Both A and R are true and Ri s not correct explanation of A

c

A is correct and R is incorrect

d

A is incorrect and R is correct

answer is A.

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Detailed Solution

Zone refining method is based on difference in solubility of impurities in molten and solid state of the metal. Elements such as Si, Ga, etc., which is used as semiconductors are refined by this method.  Highly pure metals are obtained by this method.

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