PYQ NEET- Redox Reactions L-3

Question: Which of the following reactions are disproportionation reaction?#

(a) $\mathrm{Cu}^{+} \rightarrow \mathrm{Cu}^{2+}+\mathrm{Cu}^0$ (b) $3 \mathrm{MnO}_4^{-}+4 \mathrm{H}^{+} \rightarrow 2 \mathrm{MnO}_4{ }^{2-}+\mathrm{MnO}_2+2 \mathrm{H}_2 \mathrm{O}$ (c) $2 \mathrm{KMnO}_4 \stackrel{\Delta}{\longrightarrow} \mathrm{K}_2 \mathrm{MnO}_4+\mathrm{MnO}_2+\mathrm{O}_2$ (d) $2 \mathrm{MnO}_4{ }^{-}+3 \mathrm{Mn}^{2+}+2 \mathrm{H}_2 \mathrm{O} \rightarrow 5 \mathrm{MnO}_2+4 H^{\oplus}$

A) (a), (c), and (d)

B) (a) and (b) only

C) (a) and (d) only

D) (a), (b), and (c)

Answer: (a) and (b) only#