How would you account for the following ?
The oxidising power of the following three oxoions in the series follows the order :
$V O_{2}^{+} < C r_{2} O_{7}^{2 -} < M n O_{4}^{-}$

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Solution

In the give three oxoanions, the oxidation states of V, Cr and Mn are +5,+6 and +7 respectively. As the oxidation state increases, the ease with which the oxoanions accept electrons increases. This increases the oxidizing power.

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V O_{2}^{+} < M n O_{4}^{-}

V O_{2}^{+} < C r_{2} O_{7}^{2 -} < M n O_{4}^{-}

M n^{2 +} (b) M n O_{2} (c) M n O_{4}^{-}

C r_{2} O_{7}^{2 -} + F e^{2 +} ⟶ F e^{3 +} + C r^{3 +} 1

C r_{2} O_{7}^{2 -}

V O_{2}^{+}, M n O_{4}^{-}, C r_{2} O_{7}^{2 -}

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