JEE Main 2024 Chemistry question
Among CrO, Cr₂O₃ and CrO₃, the sum of spin-only magnetic moment values of basic and amphoteric oxides is × 10⁻² BM (nearest integer). (Given atomic number of Cr is 24)
Answer: 877
Solution
CrO (basic, Cr²⁺ d⁴) has μ = √24 = 4.90 BM and Cr₂O₃ (amphoteric, Cr³⁺ d³) has μ = √15 = 3.87 BM; the sum is 8.77 BM = 877 × 10⁻² BM.