Q. When a quantity of electricity equal to that required to liberate 2.24 L of hydrogen at STP from 0.1 M aqueous $H_{2}S{O}_4$ is passed (At. mass of Cu = 63.5) then the mass of copper that will be deposited at cathode in electrolysis of 0.2 M solution of copper sulphate will be:
(1)  1.59g                                          (2)  3.18g
(3)  6.35g                                          (4)  12.70g