JEE Main · 2022 · 27 Jun 2022 · Shift 1 · d and f Block Elements

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Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the manganese product formed from the above reaction is ____ B.M. (Nearest Integer)

Answer: 6

Solution

The reaction is:

2 KMnO_{4} + 5 H_{2} C_{2} O_{4} + 3 H_{2} SO_{4} \to K_{2} SO_{4} + 2 MnSO_{4} + 10 CO_{2} + 8 H_{2} O

The manganese product is

Mn^{2 +}

with electronic configuration [Ar]3d⁵, having 5 unpaired electrons.

The spin-only magnetic moment is:

μ = n (n + 2) = 5 (5 + 2) = 35 \approx 5.92 B.M.

Rounding to the nearest integer gives 6 B.M.

JEE Main · 2022 · 27 Jun 2022 · Shift 1 · Integer answer

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