JEE Main 2022 · 27 Jul · Shift 1 · Chemistry Q71

← JEE Main 2022 · 27 Jul · Shift 1

ChemistrySingle correct+4 / -1Question 71 of 90

Given below are two statements.

Statement I: Iron (III) catalyst, acidified $\mathrm{K_2Cr_2O_7}$ and neutral $\mathrm{KMnO_4}$ have the ability to oxidise $\mathrm{I^-}$ to $\mathrm{I_2}$ independently.

Statement II: Manganate ion is paramagnetic in nature and involves $p\pi-p\pi$ bonding.

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

Both Statement I and Statement II are true.

Both Statement I and Statement II are false.

Statement I is true but Statement II is false.

Statement I is false but Statement II is true.

Answer and worked solution

Official answer: B

Statement I. Neutral $\mathrm{KMnO_4}$ oxidises $\mathrm{I^-}$ to iodate, not $\mathrm{I_2}$ . False.

Statement II. Manganate ( $d^1$ ) is paramagnetic, but its Mn-O π bonding is $p\pi$ - $d\pi$ . False.

(B)

Topics:Important compounds (KMnO4, K2Cr2O7)Oxidation number

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JEE Main 2022 · 27 Jul · Shift 1, Chemistry question 71