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All the following are disproportionation reactions (unbalanced equations are given) except

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$H_{3} P O_{3} \to H_{3} P O_{4} + P H_{3}$

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

$C l_{2} + O H^{-} \to C l^{-} + C l O_{3}^{-}$

$N O_{2}^{-} \to N O_{3}^{-} + N O$

answer is B.

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Detailed Solution

$2 K M n^{+ 7} O_{4}^{- 2} \to K_{2} M n^{+ 6} O_{4} + M n^{+ 4} O_{2} + O_{2}^{0}$
‘Mn’ undergoes reduction;
‘O’ undergoes oxidation;
It is not a disproportionation reaction

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