The standard reduction potential for Fe2+ / Fe and Sn2+ / Sn electrodes are -0.44 and -0.14 volt respectively. For the given cell reaction Fe2+ + Sn → Fe + Sn2+, the standard EMF is

1
+ 0.30 V
2
- 0.58 V
3
+ 0.58 V
4
- 0.30 V

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