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Number of complexes from the following with even number of unpaired "d" electrons is____. [V(H 2 O) 6 ] 3+ , [Cr(H 2 O) 6 ] 2+ , [Fe(H 2 O) 6 ] 3+ , [Ni(H 2 O) 6 ] 3+ , [Cu(H 2 O) 6 ] 2+ [Given atomic numbers : V = 23, Cr = 24, Fe = 26, Ni = 28, Cu = 29]

1. 2
2. 4
3. 5
4. 1

Correct answer: 2

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