The standard electrode potential \( \left(\mathrm{E}^{\circ}\right) \) values of \( \mathrm{Al}^...

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The standard electrode potential \( \left(\mathrm{E}^{\circ}\right) \) values of \( \mathrm{Al}^{3+}\left|\mathrm{Al}, \mathrm{Ag}^{+}\right| \mathrm{Ag}, \mathrm{K}^{+} \mid \mathrm{K} \) and \( \mathrm{Cr}^{3+} \mid \mathrm{Cr} \) are
\( \mathrm{P} \) \( -1.66 \mathrm{~V}, 0.80 \mathrm{~V},-2.93 \mathrm{~V} \) and \( -0.74 \mathrm{~V} \) respectively.

W
The correct decreasing order of reducing power of the metal is :
(1) \( \mathrm{Ag}\mathrm{Cr}\mathrm{Al}\mathrm{K} \)
(2) \( \mathrm{K}\mathrm{Al}\mathrm{Cr}\mathrm{Ag} \)
(3) \( \mathrm{K}\mathrm{Al}\mathrm{Ag}\mathrm{Cr} \)
(4) \( \mathrm{Al}\mathrm{K}\mathrm{Ag}\mathrm{Cr} \)
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