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Which of the following reactions are disproportion reactions?
$2 C u^{+} \to C u^{2 +} + C u$
$3 M n O_{4}^{- 2} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O$
$2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}$
$2 M n O_{4}^{-} + 3 M n^{+ 2} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}$

3 M n O_{4}^{- 2} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O

2 C u^{+} \to C u^{2 +} + C u

2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}

2 M n O_{4}^{-} + 3 M n^{+ 2} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}

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(b)

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(c)

2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}

(d)

2 M n O_{4}^{-} + 3 M n^{+ 2} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}

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Which of the following reactions are disproportionation reactions?
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\to

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Select the correct option from the following:

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