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JEE Main levelSingle correct optionDifficulty 2 of 3df012

Among Cr, Mn, Fe and Ni, the standard electrode potential $E^{\circ} (M X^{2 +} / M)$ is most negative for

ANi
BCr
CFe
DMn

Answer: D

The values are about Mn

- 1.18 V

, Cr

- 0.91 V

, Fe

- 0.44 V

and Ni

- 0.25 V

.

Mn X^{2 +}

(

3 d^{5}

) is especially stable, so Mn is the strongest reductant of the four.

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