Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the — d and f Block Elements Chemistry Question
Question
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).
💡 Solution & Explanation
**Step 1: Identify the manganese product** In acidified potassium permanganate oxidation of oxalic acid, MnO₄⁻ (Mn⁷⁺) is reduced to Mn²⁺. **Step 2: Determine electron configuration of Mn²⁺** Mn (Z = 25): [Ar] 3d⁵ 4s² Mn²⁺: [Ar] 3d⁵ (loses 2 electrons from 4s orbital) **Step 3: Count unpaired electrons** 3d⁵ configuration: ↑ ↑ ↑ ↑ ↑ (five unpaired electrons) n = 5 unpaired electrons **Step 4: Apply spin-only magnetic moment formula** μ = √[n(n+2)] B.M. where n = number of unpaired electrons **Step 5: Calculate** μ = √[5(5+2)] μ = √[5 × 7] μ = √35 μ = 5.916 B.M. **Step 6: Round to nearest integer** μ ≈ 6.00 B.M. Therefore, the answer is 6.00.