Which of the following reactions are disproportionation reaction?

(a) 2Cu^+ \rightarrow Cu^{2+} + Cu^0

(b) 3MnO^{2-}_{4} + 4H^+ \rightarrow 2MnO_2 + 2H_2O

(c) 2KMnO_4^{-}\overset{\Delta}\longrightarrow K_2MnO_4 + MnO_2 + O_2

(d) 2MnO_4^- + 3Mn^{2+} + 2H_2O \rightarrow 5MnO_2 + 4H^{\bigoplus}

Select the correct option from the following:

 

  • Option 1)

    (a) and (b) only

  • Option 2)

    (a), (b) and (c)

  • Option 3)

    (a), (c) and (d)

  • Option 4)

    (a) and (d) only

Answers (1)

Option 1

Disproportionation is a type of redox reaction in which a species is simultaneously reduced and oxidised forming two different products.

\therefore (a) 2Cu^+ \rightarrow Cu^{2+} + Cu^0

(b) 3MnO^{2-}_{4} + 4H^+ \rightarrow 2MnO_2 + 2H_2O3\overset{+6}{Mn}O^{2-}_{4} + 4H^+ \rightarrow 2\overset{+7}{Mn}O_4^{- } +\overset{+4}{Mn}O_2 + 2H_2O


Option 1)

(a) and (b) only

Option 2)

(a), (b) and (c)

Option 3)

(a), (c) and (d)

Option 4)

(a) and (d) only

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