(a)     Name the method of refining which is

           (i)      used to obtain semiconductor of high purity

           (ii)     used to obtain low boiling point

(b)     Write chemical reactions taking place in the extraction of copper from Cu_{2}S.

 

 

 

 
 
 
 
 

Answers (1)

(a)         (i) Zone refining

             (ii)  Distillation

(b)     The steps involved in the exttraction of copper from Cu_{2}S are:

 Cu_{2}S(s)+3O_{2}(g)\rightarrow 2Cu_{2}O(s)+2SO_{2}(g)

2Cu_{2}O(s)+Cu_{2}S(s)\rightarrow 6Cu(s)+SO_{2}(g)

This process is known as autareduction.

The copper obtained here is impure.It is refined by electrolytic refining.

At cathode:

Cu^{2+}(aq)+2e^{-}\rightarrow Cu(s)

At anode:

Cu(s)\rightarrow Cu^{2+}+2e^{-}

 

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