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Valence Bond Theory

Assertion: Cr...

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Assertion: {\lbrack Cr(H2O)6\rbrack}^{3+ }is inner orbital complex Reason: H_2O is strong ligand generall

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Q. Assertion :A stable complex is formed when ethylene diamine (en) is added to

[N i (H_{2} O)_{4}]^{2 +}

. Reason: (en) being a strong ligand replaces weak ligand

H_{2} O

and thus, chelate is formed.

Q. Assertion :Inner orbital complexes are low spin complexes. Reason: In low spin complexes, inner d-orbital (3d) is used in hybridisation.

[F e (H_{2} O)_{6}]^{3 +}

is strongly paramagnetic whereas

[F e (C N)_{6}]^{3 -}

is weakly paramagnetic. Reason:

H_{2} O

is a week field ligand and

C N^{-}

is a strong field ligand.

Q. Assertion :According to crystal field theory, during complex formation, the d - orbitals split and form two sets of orbitals

t_{2 g}

e_{g}

Reason: Splitting of d - orbitals occurs only in case of strong field ligand

Q. Assertion :After splitting of d-orbitals during complex formation, the orbitals form two sets of orbitals

t_{2 g}

e_{g}

octahedral field. Reason: Splitting of d-orbitals occurs only in the case of strong field ligands Such as

C N^{-}

.

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