JEE Main 2022 — Chemistry Physical Chemistry

2022mcqmedium

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

Official previous-year question

Held on 26 Jun 2022 · Verified 6 Jul 2026.

Options

A
$3{\mathrm{MnO}}_{4}^{2-}+4{H}^{+}\rightarrow 2{\mathrm{MnO}}_{4}^{-}+{\mathrm{MnO}}_{2}+2{H}_{2}O$
B
${\mathrm{MnO}}_{4}^{-}+4{H}^{+}+4{e}^{-}\rightarrow {\mathrm{MnO}}_{2}+2{H}_{2}O$
C
$10{I}^{-}+2{\mathrm{MnO}}_{4}^{-}+16{H}^{+}\rightarrow 2{\mathrm{Mn}}^{2}++8{H}_{2}O+5{I}_{2}$
D
$8{\mathrm{MnO}}_{4}^{-}+3{S}_{2}{O}_{3}^{2-}+{H}_{2}O\rightarrow 8{\mathrm{MnO}}_{2}+6{\mathrm{SO}}_{4}^{2-}+2{\mathrm{OH}}^{-}$

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Solution

Disproportionation reaction, also sometimes called dismutation reaction, is basically a type of redox reaction involving simultaneous reduction and oxidation of atoms of the same element from one oxidation state (OS) to two different oxidation states.

$\overset{+6}{3{\mathrm{MnO}}_{4}^{2-}}+4{H}^{+}\longrightarrow \overset{+7}{2{\mathrm{MnO}}_{4}^{-}}+\overset{+4}{{\mathrm{MnO}}_{2}}+2{H}_{2}O$

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Options

$3{\mathrm{MnO}}_{4}^{2-}+4{H}^{+}\rightarrow 2{\mathrm{MnO}}_{4}^{-}+{\mathrm{MnO}}_{2}+2{H}_{2}O$

${\mathrm{MnO}}_{4}^{-}+4{H}^{+}+4{e}^{-}\rightarrow {\mathrm{MnO}}_{2}+2{H}_{2}O$

$10{I}^{-}+2{\mathrm{MnO}}_{4}^{-}+16{H}^{+}\rightarrow 2{\mathrm{Mn}}^{2}++8{H}_{2}O+5{I}_{2}$

$8{\mathrm{MnO}}_{4}^{-}+3{S}_{2}{O}_{3}^{2-}+{H}_{2}O\rightarrow 8{\mathrm{MnO}}_{2}+6{\mathrm{SO}}_{4}^{2-}+2{\mathrm{OH}}^{-}$

Solution

$\overset{+6}{3{\mathrm{MnO}}_{4}^{2-}}+4{H}^{+}\longrightarrow \overset{+7}{2{\mathrm{MnO}}_{4}^{-}}+\overset{+4}{{\mathrm{MnO}}_{2}}+2{H}_{2}O$

JEE Main 2022 — Chemistry Physical Chemistry

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JEE Main 2022 — Chemistry Physical Chemistry

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Solution

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JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

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