JEE Main 2024 — Chemistry Inorganic Chemistry

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Alkaline oxidative fusion of ${\mathrm{MnO}}_{2}$ gives " $A$ " which on electrolytic oxidation in alkaline solution produces $B.A$ and $B$ respectively are:

Official previous-year question

Held on 30 Jan 2024 · Verified 6 Jul 2026.

Options

A
${\mathrm{Mn}}_{2}{O}_{7}$ and ${\mathrm{MnO}}_{4}^{-}$
B
${\mathrm{MnO}}_{4}^{2-}$ and ${\mathrm{MnO}}_{4}^{-}$
C
${\mathrm{Mn}}_{2}{O}_{3}$ and ${\mathrm{MnO}}_{4}^{2-}$
D
${\mathrm{MnO}}_{4}^{2-}$ and ${\mathrm{Mn}}_{2}{O}_{7}$

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Solution

The alkaline oxidative fusion is a redox reaction (undergoes both oxidation and reduction simultaneously) in which a compound undergoes fusion with itself only, in the presence of a base or an alkaline solution.

Electrolysis is a chemical process where an electric current is passed through an electrolyte, causing a non-spontaneous chemical reaction to occur, typically resulting in the decomposition of the electrolyte into its constituent elements or ions.

Alkaline oxidative fusion of ${\mathrm{MnO}}_{2}$ :

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

Electrolytic oxidation of ${\mathrm{MnO}}_{4}^{2-}$ in alkaline medium.

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

Hence, the answer is option B.

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Options

${\mathrm{Mn}}_{2}{O}_{7}$ and ${\mathrm{MnO}}_{4}^{-}$

${\mathrm{MnO}}_{4}^{2-}$ and ${\mathrm{MnO}}_{4}^{-}$

${\mathrm{Mn}}_{2}{O}_{3}$ and ${\mathrm{MnO}}_{4}^{2-}$

${\mathrm{MnO}}_{4}^{2-}$ and ${\mathrm{Mn}}_{2}{O}_{7}$

Solution

Alkaline oxidative fusion of ${\mathrm{MnO}}_{2}$ :

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

Electrolytic oxidation of ${\mathrm{MnO}}_{4}^{2-}$ in alkaline medium.

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

Hence, the answer is option B.

JEE Main 2024 — Chemistry Inorganic Chemistry

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JEE Main 2024 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main Inorganic Chemistry in other years

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Other Chemistry topics for JEE Main

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