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Q.

If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out by:

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a

cupellation

b

electrolytic refining

c

zone refining

d

poling

answer is A.

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Detailed Solution

Cupellation, Pb present in Ag is removed by cupellation. Pb+12O2→PbO↑Because Pb has more affinity for oxygen as compared to Ag.
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