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Which of the following statements is correct? (Atomic number of Ni = 28)

1. [Ni(CO)4] is diamagnetic and [NiCl4]2– and [Ni(CN)4]2– are paramagnetic
2. [Ni(CO)4] and [Ni(CN)4]2– are diamagnetic and [NiCl4]2– is paramagnetic
3. [Ni(CO)4] and [NiCl4]2– are diamagnetic and [Ni(CN)4]2– is paramagnetic
4. [NiCl4]2– and [Ni(CN)4]2– are diamagnetic and [Ni(CO)4] is paramagnetic

Correct answer: [Ni(CO)4] and [Ni(CN)4]2– are diamagnetic and [NiCl4]2– is paramagnetic

Solution

[Ni(CO)4] and [Ni(CN)4]2– are diamagnetic because CO and CN– are strong field ligands that cause pairing of electrons in the d-orbitals. [NiCl4]2– is paramagnetic because Cl– is a weak field ligand, and unpaired electrons remain in the d-orbitals.

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