JEE MAIN - Chemistry (2022 - 27th July Morning Shift - No. 7)
Given below are two statements.
Statement I : Iron (III) catalyst, acidified $$\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$$ 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 $$\mathrm{p} \pi-\mathrm{p} \pi$$ 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.
Explanation
Manganate ion $\mathrm{MnO}_{4}^{2-}$ has tetrahedral structure
_27th_July_Morning_Shift_en_7_1.png)
has only $\mathrm{d} \pi-\mathrm{p} \pi\,\, \pi$-bonds.
$\mathrm{Fe}^{3+}$ is not used as a catalyst in the conversion of I- to $\mathrm{I}_{2}$ by $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ oxidise $\mathrm{I}^{-}$ in acidic medium easily
has only $\mathrm{d} \pi-\mathrm{p} \pi\,\, \pi$-bonds.
$\mathrm{Fe}^{3+}$ is not used as a catalyst in the conversion of I- to $\mathrm{I}_{2}$ by $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ oxidise $\mathrm{I}^{-}$ in acidic medium easily
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