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Question

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?


A

Van Arkel-de Boer Refining

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B

Mond’s process

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C

Cupellation

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D

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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