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(i) Given below are steps for extraction of copper from its ore. Write the reaction involved.

     a
. Roasting of copper (I) sulphide
     b
. Reduction of copper (I) oxide with copper (I) sulphide
     c
. Electrolytic refining
  
Answer variants:
\(2Cu_2S(s)+3O_2(g)→2Cu_2O(s)+2SO_2(g)\)
\(2Cu_2S(s)+2O_2(g)→2Cu_2O(s)+SO_2(g)\)
\(2Cu_2O(s)+Cu_2S(s)→6Cu(s)+SO_2\)
a. Roasting of copper (I) sulphide:
  
b. Reduction of copper (I) oxide with copper (I) sulphide:
 
(ii) Draw the neat and labelled diagram for electrolytic refining of copper.
  
(Note: Select the correct diagram from the given options.)