Which one of the following is an example of disproportionation reaction?

3 {C l}_{2} (g) + 6 {O H}^{-} (a q) \to {C l O}_{3}^{-} (a q) + 5 {C l}^{-} (a q) + 3 H_{2} O (1)

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{A g}^{2 +} (a q) + A g (s) \to 2 {A g}^{+} (a q)

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Z n (s) + C u {S O}_{4} (a q) \to C u (s) + Z n {S O}_{4} (a q)

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2 K C l O_{3} (s) \to 2 K C l (s) + 3 O_{2} (g)

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Solution

The correct option is D $3 {C l}_{2} (g) + 6 {O H}^{-} (a q) \to {C l O}_{3}^{-} (a q) + 5 {C l}^{-} (a q) + 3 H_{2} O (1)$
The reaction in option A is an example of a disproportionation reaction.

$3 {C l}_{2} (g) + 6 {O H}^{-} (a q) \to {C l O}_{3}^{-} (a q) + 5 {C l}^{-} (a q) + 3 H_{2} O (l)$
In this reaction, chlorine is simultaneously oxidized and reduced. Chlorine is oxidized to $C l O_{3}^{-}$ and chlorine is reduced to chloride ion.

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