PYQ NEET- Redox Reactions L-9

Question: Q.6. Which of the following reactions are disproportionation reaction? (2019)#

(a) $2 \mathrm{Cu}^{+} \rightarrow \mathrm{Cu}^{2+}+\mathrm{Cu}$

(b) $3 \mathrm{MnO}_4^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_4^{-}+\mathrm{MnO}_2+2 \mathrm{H}_2 \mathrm{O}$

(c) $2 \mathrm{KMnO}_4 \stackrel{\Delta}{\longrightarrow} \mathrm{K}_2 \mathrm{MnO}_4+\mathrm{MnO}_2+\mathrm{O}_2$

(d) $2 \mathrm{MnO}_4^{-}+3 \mathrm{Mn}^{2+}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 5 \mathrm{MnO}_2+4 \mathrm{H}^{\oplus}$

A) (a) and (b) only

B) (a), (b) and (c)

C) (a), (c) and (d)

D) (a) and (d) only

Answer: (a) and (b) only#