Question

Amongst Ni(CO)₄, [Ni(CN)₄]^2- and NiCl₄^2-

(a)  Ni(CO)₄ and NiCl₄^2- are diamagneric but [Ni(CN)₄]^2- is paramagnetic

(b)  Ni(CO)₄, [Ni(CN)₄]^2- are diamagnetic but NiCl₄^2- is paramagnetic

(c) [Ni(CN)₄]^2- and NiCl₄^2- are diamagnetic but Ni(CO)₄ is paramagnetic

(d) Ni(CO)₄ is diamagnetic but [Ni(CN)₄]^2- and NiCl₄^2- are paramagnetic

Answer 1

Correct option (b)  Ni(CO)₄, [Ni(CN)₄]^2- are diamagnetic but NiCl₄^2- is paramagnetic

Explanation:

Ni (28) Ni²⁺ both have two unpaired electrons. CO and CN^- are strong field ligands and thus, unpaired electrons get paired. Hence, Ni(CO)₄ and [Ni(CN)₄]^2- are diamagnetic. While Cl^- as a weak field ligand, hence NiCl₄^2- is paramagnetic

Comments

Correct :-)