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

ChemistryRedox ReactionsJEE Main

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A $\begin{aligned} & 3 \mathrm{Cl}_2(g)+6 \mathrm{OH}^{-}(a q) \longrightarrow \mathrm{ClO}_3^{-}(a q)+5 \mathrm{Cl}^{-}(a q) \\ & +3 \mathrm{H}_2 \mathrm{O}(l) \\ & \end{aligned}$
B $\mathrm{Ag}^{2+}(\mathrm{aq})+\mathrm{Ag}(\mathrm{s}) \longrightarrow 2 \mathrm{Ag}^{+}(\mathrm{aq})$
C $\mathrm{Zn}(s)+\mathrm{CuSO}_4(a q) \longrightarrow \mathrm{Cu}(s)+\mathrm{ZnSO}_4(a q)$
D $2 \mathrm{KClO}_3(\mathrm{~s}) \longrightarrow 2 \mathrm{KCl}(\mathrm{s})+3 \mathrm{O}_2(\mathrm{~g})$