The standard electrode potential values of are , , and , respectively. The correct decreasing order of reducing power of the metal is [2019]

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Solution

Q.
The standard electrode potential $(E °)$ values of ${Al}^{3 +} / Al, {Ag}^{+} / Ag, K^{+} / K, and {Cr}^{3 +} / Cr$ 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 [2019]

1 Ag > Cr > Al > K

2 K > Al > Cr > Ag

3 K > Al > Ag > Cr

4 Al > K > Ag > Cr

Ans.
(2)

Higher the value of $E_{red}^{\circ}$ , stronger is the oxidising power. Thus, the decreasing order of reducing power of the metal is K > Al > Cr > Ag.

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