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JEE Main 2025 Chemistry question

ChemistryThe d and f-Block ElementsJEE Main 2025

Among, Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is BM (in nearest integer).

Answer: 4

Solution

Co has highest enthalpy of atomisation (425 kJ/mol); Co²⁺: [Ar]3d⁷; μ = √(3(3+2)) = √15 ≈ 3.87 ≈ 4

Question ID VK-002641