You are an alchemist who is trying to remove hard lead impurity from Crude silver. You can only use thermal refining by using a blast of air. What would you use?

Van Arkel-de Boer Refining

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Mond’s process

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Cupellation

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Linz-Donawitz process

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Solution

The correct option is C
Cupellation

Options a and b are both part of vapour phase refining while option d is applicable for steel making. Cupellation is carried out on a boat shaped container in which the surface of the molten impure metal is treated with a blast of hot air. The impurities are oxidized to volatile oxides and they escape with the blast.

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