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(a) Name the method of refining which is...

(a) Name the method of refining which is
(i) used to obtain semiconductor of high purity
(ii) used to obtain low boiling metal.
(b) Write chemical reactions taking place in the extraction of copper from `Cu_(2)S`.

Text Solution

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(i) Zone refining. (ii) Distillation.
(b) It is first heated in air to get copper oxide.
`2Cu_(2)S+3O_(2)to2Cu_(2)O+2SO_(2)`
It is then reduced to the corresponding copper metal by the following reaction
`2Cu_(2)O+Cu_(2)Sto6Cu+SO_(2)`
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