JEE Main 2024 Chemistry question
A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula MO (where n = 3,4,5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is BM (near integer) (Given atomic number: Sc: 21, Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26, Co: 27, Ni: 28, Cu: 29, Zn: 30)
Answer: 0
Solution
The metal is vanadium (V₂O₃, V₂O₄, V₂O₅); the amphoteric oxide is V₂O₅, in which V⁵⁺ is d⁰, so the magnetic moment is 0 BM.