The correct statement among the following is: + A 2-[Ni(CN)4] and [NiCl4]2 are diamagnetic and Ni(CO)4 is paramagnetic. Ni(CO) 4 is diamagnetic and 2-Ⓑ [NiCl4] and [Ni(CN)4]2 are B paramagnetic.

The correct statement among the following is.

Q. The correct statement among the following is:

(A) [Ni(CN)₄]²⁻ and [NiCl₄]²⁻ are diamagnetic and Ni(CO)₄ is paramagnetic.

(B) Ni(CO)₄ is diamagnetic and [NiCl₄]²⁻ and [Ni(CN)₄]²⁻ are paramagnetic.

(D) Ni(CO)₄ and [Ni(CN)₄]²⁻ are diamagnetic and [NiCl₄]²⁻ is paramagnetic.

Correct Answer: (D)

Explanation

In Ni(CO)₄, nickel is in the zero oxidation state. CO is a strong field ligand and causes complete pairing of electrons, making Ni(CO)₄ diamagnetic.

In [Ni(CN)₄]²⁻, nickel is in +2 oxidation state. CN⁻ is a strong field ligand and leads to square planar geometry with all electrons paired, hence it is diamagnetic.

In [NiCl₄]²⁻, Cl⁻ is a weak field ligand. The complex has tetrahedral geometry with unpaired electrons, therefore it is paramagnetic.

Hence, Ni(CO)₄ and [Ni(CN)₄]²⁻ are diamagnetic while [NiCl₄]²⁻ is paramagnetic.

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