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The standard reduction potential for Fe2+|Fe and Sn2+|Sn electrodes are -0.44 V and -0.14 V respectively. For the cell reaction, Fe2+ + Sn            Fe + Sn2+, the standard e.m.f. is:

(a) +0.30 V

(b) 0.58 V

(c) + 0.58 V

(d) -0.30 V