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Which of these coordination compounds corresponds to the specified count of unpaired electrons?

1. [Ni(CN)4]2−: Unpaired electrons = 0
2. [Cr(NH3)6]3+: Unpaired electrons = 3
3. [Fe(H2O)6]2+: Unpaired electrons = 4
4. [Ni(H2O)6]2+: Unpaired electrons = 2

Correct answer: [Ni(CN)4]2−: Unpaired electrons = 0

Solution

In [Ni(CN)4]2−, CN− is a strong field ligand that causes pairing of electrons in the d-orbitals of Ni2+, resulting in no unpaired electrons. The other options have incorrect unpaired electron counts.

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