The emf of the cell in which the following reaction occurs is found to be 0.5105 at 298 K Zn(s) +Ni+(0.1M) -changes to Zn+(1M) +Ni(s). Thw standard emf of the cell is

(1)0.4810 V
(2)0.5696 V
(3)-0.5105
(4)0.5400 V