JEE Main · 2022 · 29 Jun 2022 · Shift 1 · d and f Block Elements

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An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is ____
B.M. (Nearest integer)

Answer: 0

Solution

Acidified manganate (MnO₄²⁻) undergoes disproportionation:

3 MnO_{4}^{2 -} + 4 H^{+} ⟶ 2 MnO_{4}^{-} + MnO_{2} + 2 H_{2} O

The product with manganese in higher oxidation state is permanganate (MnO₄⁻), where Mn is in +7 oxidation state.

Mn⁷⁺ has electronic configuration [Ar]3d⁰ (all d-electrons are removed). With zero unpaired electrons, the spin-only magnetic moment is:

μ = n (n + 2) = 0 (0 + 2) = 0 B.M.

Answer: 0

JEE Main · 2022 · 29 Jun 2022 · Shift 1 · Integer answer

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