This was another popular question among the candidates and was fairly well attempted.  Some candidates however, lost marks for using wrong terminologies.  Examples instead of decomposition some candidates used dissociation or disassociation.  Instead of electrolytes some candidates used substances.
The expected answers are:                    
  (a)     Electrolysis is the  process  by which a solution or a molten substance is broken
           down into its component parts by the passage of (a direct) electric current/electricity.

 (b)    Mass of copper deposited   =   zIt
                                                           =   3.27 x 10-7 x 2 x 5 x 60
                                                           =   1.962 x 10 -4 kg.