Question

 During extraction of metals, electrolytic refining is used to obtain pure metals. (a) Which material will be used as anode and cathode .for refining of silver metal by this process?(b) Suggest a suitable electrolyte also. (c) In this electrolytic cell, where do we get pure silver after passing electric current? 

Answer 1

(a) Thin strip of pure silver is made the cathode (It is connected to the negative terminal of the battery). And impure. silver block is made anode (it is connected-to the positiv terminal of the battery).
(b) The eiectr’ yte is any salt solution of silver like `AgNO_(3)` but sodium argentocyanide `Na [Ag(CN)_(2)]` is preferred.
(c) On passing eleetric current, impure metal dissolves from the anode and goes into the electrolyte solution and pure metal from the electrolyte deposits on the cathode.