Explain on the basis of valence bond the | Class 12 Chemistry Chapter Coordination Compounds, Coordination Compounds NCERT Solutions

Question:

Explain on the basis of valence bond theory that [Ni(CN)4]2- ion with square planar structure is diamagnetic and the [Ni(CN)4]2- ion with tetrahedral geometry is paramagnetic.

Answer:

Ni is in the +2 oxidation state i.e., in d8 configuration.

There are 4 CN- ions. Thus, it can either have a tetrahedral geometry or square planar geometry. Since CN- ion is a strong field ligand, it causes the pairing of unpaired 3d electrons.

It now undergoes dsp2 hybridization. Since all electrons are paired, it is diamagnetic.

In case of [Ni(CN)4]2- , Cl- ion is a weak field ligand. Therefore, it does not lead to the pairing of unpaired 3d electrons. Therefore, it undergoes sp3 hybridization.

Since there are 2 unpaired electrons in this case, it is paramagnetic in nature.


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Welcome to the NCERT Solutions for Class 12 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 5: Explain on the basis of valence bond theory that [Ni(CN)4]2- ion with square planar structure is dia....