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Standard electrode potential of three metals X, Y and Z are -1.2 V, +0.5 V and -3.0 V, respectively. The reducing power of these metals will be :

1. Y > Z > X
2. X > Z > Y
3. Z > Y > X
4. X > Y > Z

Correct answer: X > Y > Z

Solution

The reducing power of a metal is inversely proportional to its standard electrode potential. Since Z has the most negative potential (-3.0 V), it has the highest reducing power, followed by X (-1.2 V), and then Y (+0.5 V).

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