Discuss the nature of bonding in the ...

NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

Question : 15 of 43

Marks: +1, -0

Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory :

(i)

[Fe(CN)_6] ^{4–}

(ii)

[FeF_6] ^{3– }

(iii)

[Co(C_2O_4)_3] ^{3–}

(iv)

[CoF_6]^{3-}

Solution:

(i) $[Fe(CN)_6] ^{4–}$ : Fe(26) has electronic configuration

[Ar] 4s^{2} 3d^{6}

^{2+ }

has electronic configuration

[Ar] 4s^{2} 3d^{6}

^{–}

ion causes pairing of electrons because it is a strong field ligand.

It has octahedral shape and is diamagnetic in nature due to absence of electrons.

(ii) $[FeF_6] ^{3– }$ : Fe(26) has electronic configuration

[Ar] 4s^{2} 3d^{6} . Fe^{3+} : [Ar] 4s^{0} 3d^{5} F

being a weak field ligand, does not cause pairing of electrons.

(iii) $[Co(C_2O_4)_3] ^{3–}$ : Co(27) has electronic configuration

[Ar] 4s^{2} 3d^{7}

Co^{3+} : [Ar]4s^{0} 3d^{6}

C_2O_4 ^{2–}

being a strong field ligand causes pairing of electrons.

(iv) $[CoF_6]^{3-}$ : Co(27) has electronic configuration

[Ar] 4s^{2} 3d^{7}

Co^{3+} : [Ar]4s^{0} 3d^{6} .

F–

being a weak field ligand, cannot cause pairing of electrons.

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