Question

The correct statement among the following is:

• A. \(\mathrm{Ni(CO)_4}\) is diamagnetic and \([\mathrm{NiCl_4}]^{2-}\) and \([\mathrm{Ni(CN)_4}]^{2-}\) are paramagnetic.
• B. \(\mathrm{Ni(CO)_4}\) and \([\mathrm{NiCl_4}]^{2-}\) are diamagnetic and \([\mathrm{Ni(CN)_4}]^{2-}\) is paramagnetic.
• C. \([\mathrm{Ni(CN)_4}]^{2-}\) and \([\mathrm{NiCl_4}]^{2-}\) are diamagnetic and \(\mathrm{Ni(CO)_4}\) is paramagnetic.
• D. \(\mathrm{Ni(CO)_4}\) and \([\mathrm{Ni(CN)_4}]^{2-}\) are diamagnetic and \([\mathrm{NiCl_4}]^{2-}\) is paramagnetic.

Hint:

Strong-field ligands (CN\(^-\), CO) favour pairing and diamagnetism, while weak-field ligands (Cl\(^-\)) lead to paramagnetism.

Answer 1

The Correct Option is D