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  • (i) Given below are the steps for extraction of copper from its ore.Write the reaction involved(a) Roasting of copper (1)sulphide(b)Reductionof copper(1)oxide with copper(1)sulphide(c)Electrolytic refining(ii)Draw a neat and welllabelled diagram l

(i) Given below are the steps for extraction of copper from its ore. Write the reaction involved.
(a) Roasting of copper (1) sulphide
(b) Reduction of copper (1) oxide with copper (1) sulphide.
(c) Electrolytic refining
(ii) Draw a neat and well labelled diagram for electrolytic refining of copper

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Ans.

(i) 2Cu_{2}S\left ( s \right )+3O_{2}\left ( g \right )\rightarrow Cu_{2}O\left ( s \right )+2SO_{2}\left ( g \right )
(ii) 2Cu_{2}O\left ( s \right )+Cu_{2}S\left ( s \right )\rightarrow 6Cu\left ( s \right )+SO_{2}\left ( g \right )   
(iii) Electrolytic refining: Electrolytic refining is a process of refining a metal by the process of electrolysis.
A thick block of the impure metal is made anode (+ ve)
A thin strip of pure metal is made cathode (- ve)
CuSO4 solution is taken as electrolyte.
At cathode:                          Cu^{2+}\left ( aq \right )+2e^{-}\rightarrow Cu
At anode                             Cu\left ( s \right )\rightarrow Cu^{2+}\left ( aq \right )+2e^{-}

(b)

 

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