JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqmedium

${\mathrm{KMnO}}_{4}$ oxidises ${I}^{-}$ in acidic and neutral/faintly alkaline solution, respectively to

Official previous-year question

Held on 30 Jan 2023 · Verified 6 Jul 2026.

Options

A
${I}_{2}$ and ${\mathrm{IO}}_{3}^{-}$
B
${\mathrm{IO}}_{3}^{-}$ and ${I}_{2}$
C
${\mathrm{IO}}_{3}^{-}$ and ${\mathrm{IO}}_{3}^{-}$
D
${I}_{2}$ and ${I}_{2}$

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Solution

In the acidic medium, ${\mathrm{MnO}}_{4}^{-}$ convert to ${\mathrm{Mn}}^{2+}$ and ${I}^{-}$ convert to ${I}_{2}$ .

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

In neutral/faintly alkaline solution, ${\mathrm{MnO}}_{4}^{-}$ convert to ${\mathrm{MnO}}_{2}$ and ${I}^{-}$ convert to ${\mathrm{IO}}_{3}^{-}$ .

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

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JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqmedium

${\mathrm{KMnO}}_{4}$ oxidises ${I}^{-}$ in acidic and neutral/faintly alkaline solution, respectively to

Official previous-year question

Held on 30 Jan 2023 · Verified 6 Jul 2026.

Options

A
${I}_{2}$ and ${\mathrm{IO}}_{3}^{-}$
B
${\mathrm{IO}}_{3}^{-}$ and ${I}_{2}$
C
${\mathrm{IO}}_{3}^{-}$ and ${\mathrm{IO}}_{3}^{-}$
D
${I}_{2}$ and ${I}_{2}$

Did you get this right?

Solution

In the acidic medium, ${\mathrm{MnO}}_{4}^{-}$ convert to ${\mathrm{Mn}}^{2+}$ and ${I}^{-}$ convert to ${I}_{2}$ .

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

In neutral/faintly alkaline solution, ${\mathrm{MnO}}_{4}^{-}$ convert to ${\mathrm{MnO}}_{2}$ and ${I}^{-}$ convert to ${\mathrm{IO}}_{3}^{-}$ .

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

JEE Main 2023 — Chemistry Inorganic Chemistry

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JEE Main Inorganic Chemistry in other years

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JEE Main 2023 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main Inorganic Chemistry in other years

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Physical Chemistry

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