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The standard electrode potential (E°) values of Al³⁺/Al, Ag⁺/Ag, K⁺/K and Cr³⁺/Cr are -1.66 V, 0.80 V, -2.93 V and -0.74 V, respectively. The correct decreasing order of reducing power of the metal is

1. Al > K > Ag > Cr
2. Ag > Cr > Al > K
3. K > Al > Cr > Ag
4. K > Al > Ag > Cr

Correct answer: K > Al > Cr > Ag

Solution

Reducing power is inversely related to the standard electrode potential (E°). A more negative E° indicates a stronger reducing agent. Among the given metals, K has the most negative E° (-2.93 V), followed by Al (-1.66 V), Cr (-0.74 V), and Ag (0.80 V). Thus, the correct order is K > Al > Cr > Ag.

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