Ans. (3)

Ans. (3) The standard reduction potential of Pb and Zn electrodes are —0.126 and —0.763 volts respectively. The e.m.f. of the cell Zn Zn2+ (0.1 M) II Pb2+ (1 M) I Pb is (1) 0.637 v (3) > 0.637 v (2) < 0.637 v (4) 0.889