JEE Main 2024 Chemistry question
Number of complexes from the following with even number of unpaired "d" electrons is . [V(HO)], [Cr(HO)], [Fe(HO)], [Ni(HO)], [Cu(HO)] [Given atomic numbers: V = 23, Cr = 24, Fe = 26, Ni = 28, Cu = 29]
Answer: (A)
Solution
Unpaired electrons: V³⁺ 2, Cr²⁺ 4, Fe³⁺ 5, Ni³⁺ 3, Cu²⁺ 1. Only V³⁺ and Cr²⁺ have an even number.