The correct statement among the following is:

Q. The correct statement among the following is:

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

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

Correct Answer: 4

Solution

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

In the complex [Ni(CN)₄]²⁻, nickel is in +2 oxidation state. Cyanide ion is a strong field ligand, leading to pairing of electrons in the d-orbitals. Hence, this complex is diamagnetic.

In the complex [NiCl₄]²⁻, chloride ion is a weak field ligand. It does not cause pairing of electrons, so unpaired electrons are present, making the complex paramagnetic.

Therefore, the correct statement is that Ni(CO)₄ and [NiCl₄]²⁻ are diamagnetic and [Ni(CN)₄]²⁻ is paramagnetic.

Q. The correct statement among the following is:

Solution

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