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NEET levelSingle correct optionDifficulty 1 of 3df060

Among the following couples, the only one with a positive standard reduction potential is

A $Cu X^{2 +} / Cu$
B $Zn X^{2 +} / Zn$
C $Fe X^{2 +} / Fe$
D $Ni X^{2 +} / Ni$

Answer: A

The values are

Zn X^{2 +} / Zn = - 0.76 V

,

Fe X^{2 +} / Fe = - 0.44 V

and

Ni X^{2 +} / Ni = - 0.25 V

, while

Cu X^{2 +} / Cu = + 0.34 V

. Hence only copper has a positive value.

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