Explain on the basis of valence bond theory ...

NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

Question : 37 of 43

Marks: +1, -0

Explain on the basis of valence bond theory that

[Ni(CN)_4] ^{2–}

ion with square planar structure is diamagnetic and the

[NiCl_4] ^{2–}

ion with tetrahedral geometry is paramagnetic.

Solution:

[Ni(CN)_4] ^{2–} : Ni(28) : 4s^{2}3d^{8};

Ni^{2+}(28) : 4s^{0}3d^{8}

CN^{–}

is a strong field ligand so, it causes pairing of electrons.

It is diamagnetic due to absence of unpaired electrons.

[NiCl_4] ^{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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