Which one of the following species is stable in aqueous solution

M n O_{4}^{2 -}

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M n O_{4}^{3 -}

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C r^{2 +}

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C u^{+}

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Solution

The correct option is A $M n O_{4}^{2 -}$
$M n O_{4}^{3 -}$ is unstable in aqueous solution as $+ 5$ oxidation state of $M n$ is unstable.
$M n O_{4}^{2 -}$ is stable in aqueous solution as $+ 6$ oxidation state of $M n$ is stable.

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How would you account for the following:

(i) Of the d⁴species, Cr²⁺ is strongly reducing while manganese(III) is strongly oxidising.

(ii) Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.

(iii) The d¹ configuration is very unstable in ions.

C u^{+}

E^{o}

E_{C u^{2 +} / C u^{+}}^{o} = 0.15, E_{C u^{2 +} / C u_{s}}^{o} = 0.34 V

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