JEE Main 2026 Chemistry question
Match the LIST-I with LIST-II List-I (Complex ion): A. [Cr(H₂O)₆]²⁺ B. [Co(H₂O)₆]²⁺ C. [Cu(H₂O)₆]²⁺ D. [Mn(H₂O)₆]²⁺ List-II (Calculated spin only magnetic moment (BM)): I. 3.87 II. 5.92 III. 4.90 IV. 1.73 Choose the correct answer from the options given below:
Answer: (D)
Solution
Cr²⁺ (d⁴, 4 unpaired) → 4.90 BM; Co²⁺ (d⁷, 3 unpaired) → 3.87 BM; Cu²⁺ (d⁹, 1 unpaired) → 1.73 BM; Mn²⁺ (d⁵, 5 unpaired) → 5.92 BM.