Question

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

Answer 1

1. 
   
   1. `2"Cu"_2"S" + 3"O"_2 overset("Heat")(->)2"Cu"_2"O" + 2"SO"_2`
   2. `2"Cu"_2"O" + "Cu"_2"S" overset("Heat")(->) 6"Cu" + "SO"_2 ` 
   3. Electrode reactions :
      Reaction at anode - `"Cu" -> "Cu"^(2+) + 2^("e"-)`
      Reaction at cathode - `"Cu"^(2+) + 2"e"^- -> "Cu"`
2.