JEE Main 2026 Chemistry question
Number of paramagnetic complexes among the following is . [MnBr₄]²⁻, [NiCl₄]²⁻, [Ni(CN)₄]²⁻, [Ni(CO)₄], [CoF₆]³⁻, [Fe(CN)₆]⁴⁻, [Mn(CN)₆]³⁻, [Ti(CN)₆]³⁻, [Cu(H₂O)₆]²⁺, [Co(C₂O₄)₃]³⁻
Answer: 6
Solution
Paramagnetic: [MnBr₄]²⁻ (Mn²⁺ d⁵, tetrahedral), [NiCl₄]²⁻ (Ni²⁺ d⁸, tetrahedral), [CoF₆]³⁻ (Co³⁺ d⁶ high spin), [Mn(CN)₆]³⁻ (Mn³⁺ d⁴ low spin), [Ti(CN)₆]³⁻
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