0.02 mole of [Co(NH3)5SO4]Br and 0.02 mole of [Co(NH3)5Br]SO4 were used to prepare 2 litre solution. One litre of this solution on treatment with excess of AgNO3 gives Y and Z respectively. Number of mole of Y and Z obtained are :
(1) 0.01, 0.02
(2) 0.02, 0.02
(3) 0.01, 0.01
(4) 0.02, 0.01