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Representation of Cell

Cr 2 O 7 2- +...

Question

${C r}_{2} O_{7}^{2 -} + X H^{\oplus} - ----- \to {C r}^{3 +} + H_{2} O$ + oxidised product of $X$ . $X$ in the above reaction cannot be:

C_{2} O_{4}^{2 -}

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{F e}^{2 +}

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S O_{4}^{2 -}

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S^{2 -}

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Solution

The correct option is D $S O_{4}^{2 -}$
$S O_{4}^{2 -}$ cannot be oxidised since $S$ is present in it in its highest oxidation state ( $+ 6$ ).

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