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(A) The reducing power of a species is inversely proportional to its standard reduction potential $(E^{\circ})$. Lower reduction potential indicates a

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$Al > Cr > Fe^{2+} > Co^{2+}$

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(A) The reducing power of a species is inversely proportional to its standard reduction potential $(E^{\circ})$. Lower reduction potential indicates a stronger tendency to undergo oxidation, thus acting as a better reducing agent. The reduction potentials are: $Al^{3+}/Al = -1.66 \ V$ $Cr^{3+}/Cr = -0.74 \ V$ $Fe^{3+}/Fe^{2+} = +0.77 \ V$ $Co^{3+}/Co^{2+} = +1.81 \ V$ Arranging these in increasing order of reduction potential: $Al Therefore, the order of reducing power (decreasing) is: $Al > Cr > Fe^{2+} > Co^{2+}$

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