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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 37
Total: 43
Explain on the basis of valence bond theory that [Ni(CN)4]2– ion with square planar structure is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic.
Solution:  
[Ni(CN)4]2–:Ni(28):4s23d8;
Ni2+(28):4s03d8
CN–is a strong field ligand so, it causes pairing of electrons.
It is diamagnetic due to absence of unpaired electrons.
In [NiCl4]2–,Cl–is a weak field ligand so, it does not cause pairing ofelectrons
It is paramagnetic due to presence of unpaired electrons.
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