JEE Main 2023 — Chemistry Physical Chemistry

2023integermedium

In alkaline medium, the reduction of permanganate anion involves a gain of ____________ electrons.

Official previous-year question

Held on 10 Apr 2023 · Verified 6 Jul 2026.

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Solution

In Faintly alkaline medium potassium permanganate changes to manganese dioxide in its oxidising action.

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

The oxidation state of manganese in ${\mathrm{MnO}}_{4}^{-}$ is +7 and in ${\mathrm{MnO}}_{2}$ is +4.

Hence, it transfers 3 electrons during the oxidising action in alkaline medium.

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JEE Main Physical Chemistry in other years

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JEE Main 2023 — Chemistry Physical Chemistry

2023integermedium

In alkaline medium, the reduction of permanganate anion involves a gain of ____________ electrons.

Official previous-year question

Held on 10 Apr 2023 · Verified 6 Jul 2026.

Did you get this right?

Solution

In Faintly alkaline medium potassium permanganate changes to manganese dioxide in its oxidising action.

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

The oxidation state of manganese in ${\mathrm{MnO}}_{4}^{-}$ is +7 and in ${\mathrm{MnO}}_{2}$ is +4.

Hence, it transfers 3 electrons during the oxidising action in alkaline medium.

Your note

JEE Main Physical Chemistry in other years

Keep practicing Physical Chemistry

Work through every JEE Main Physical Chemistry PYQ, year by year.

Browse all Chemistry topics

JEE Main 2023 — Chemistry Physical Chemistry

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

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JEE Main 2023 — Chemistry Physical Chemistry

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry