Which of the following options about the oxidizing property of $K M n O_{4}$ in acidic medium is incorrect?

H_{2} S

can be oxidised to

S O_{4}^{2 -}

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H_{2} S

can be oxidised to

S

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S O_{3}^{2 -}

can be oxidised to

S O_{4}^{2 -}

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

can be oxidised to

C O_{3}^{2 -}

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Solution

The correct options are
C $H_{2} S$ can be oxidised to $S O_{4}^{2 -}$
D $C_{2} O_{4}^{2 -}$ can be oxidised to $C O_{3}^{2 -}$
$K M n O_{4}$ is an oxidising agent. The following reactions take place in acidic medium:
1) $3 H_{2} S + 2 K M n O_{4} \to 3 S + 2 M n O_{2}$
2) $2 M n O_{4}^{-} + 5 S O_{3}^{2 -} + 6 H^{+} \to 2 M n^{2 +} + 5 S O_{4}^{2 -} + 3 H_{2} O$
3) $5 C_{2} O_{4}^{2 -} + 2 M n O_{4}^{-} + 16 H^{+} \to 10 C O_{2} + 8 H_{2} O + 2 M n^{2 +}$

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