Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II. Statement (I) : Fusion of MnO 2 with KOH and an oxidising agent gives dark green K 2 MnO 4 . Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion. In the light of the above statements, choose the correct answer from the options given below:

Both Statement I and Statement II is true

Both Statement I and Statement II is false

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Chemistry · d and f Block Elements

JEE Main 2024 — 8 April, Shift 2 — Question 76

Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II.

Statement (I) : Fusion of $\mathrm{MnO}_{2}$ with KOH and an oxidising agent gives dark green $\mathrm{K}_{2} \mathrm{MnO}_{4}$ .

Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.

In the light of the above statements, choose the correct answer from the options given below:

Option A:
Both Statement I and Statement II is true
Correct
Option B:
Both Statement I and Statement II is false
Option C:
Statement I is true but Statement II is false
Option D:
Statement I is false but Statement II is true

Answer: A

Step-by-step solution

Statement I is True: Fusion of $\mathrm{MnO_2}$ with $\mathrm{KOH}$ in the presence of an oxidising agent (such as $\mathrm{KNO_3}$ or air) produces dark green potassium manganate, $\mathrm{K_2MnO_4}$ .

$\mathrm{MnO}_{2}+4 \mathrm{KOH}+\mathrm{O}_{2} \xrightarrow{\text { fused }} 2 \mathrm{~K}_{2} \mathrm{MnO}_{4} (Dark\; green )+2 \mathrm{H}_{2} \mathrm{O}$

Statement II is True: The manganate ion $\mathrm{(MnO_4^{2-})}$ undergoes oxidation in alkaline medium, including electrolytic oxidation, to form the permanganate ion $\mathrm{(MnO_4^-)}$ .

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

Since both statements are correct, the correct answer is option A.

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 8 April, Shift 2
Subject: Chemistry
Chapter: d and f Block Elements
Topic: Compounds of Manganese

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Answer: A

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