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Tetracyano nicklate ion is diamagnetic whereas tetracholoronicklate ion is paramagnetic .why

Tetracyano nicklate ion is diamagnetic whereas tetracholoronicklate ion is paramagnetic .why

Grade:12th pass

1 Answers

Arun
25750 Points
6 years ago

Dear Student

 

[Ni(CN)4]2- = Ni2+ + 4CN-

* In [Ni(CN)4]2-, there is Ni2+ ion for which the electronic configuration in the valence shell is 3d8 4s0.

* In presence of strong field CN- ions, all the electrons are paired up. The empty 4d, 3s and two 4p orbitals undergo dsp2hybridization to make bonds with CN- ligands in square planar geometry. Thus [Ni(CN)4]2- is diamagnetic

 

NiCl42- = Ni2+ + 4Cl-

* Again in NiCl42-, there is Ni2+ ion, However, in presence of weak field Cl- ligands, NO pairing of d-electrons occurs. Therefore, Ni2+ undergoes sp3 hybridization to make bonds with Cl- ligands in tetrahedral geometry. As there are unpaired electrons in the d-orbitals, NiCl42- is paramagnetic

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