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Physical and Chemical Properties of Hydrogen

33. CN is a s...

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33. CN is a strong field ligand. This is due to the fact that :- (1) It is a pseudohalide (2) It can accept electrons from metal species (3) It forms high spin complexes with metal species (4) It carries negative charge

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C N^{-}

is a strong field ligand. This is due to the fact that:

Q. The difference in the number of unpaired electrons of a metal ion in its high-spin and low-spin octahedral complexes is two.

The metal ion is :

Q. Carbon donor ligands are strong ligands and usually forms low spin complexes. Among the complexes given below, select the high spin complex.

F e (C N)_{2}

solution is treated with KCN solution, species formed does not give tests of

F e^{2 +}

C N^{-}

K_{2} S O_{4}

solution is treated with

A l_{2} (S O_{4})_{3}

solution, species formed gives tests of

K^{+}, A l^{3 +}

S O_{4}^{2 -}

.

Species formed in experiment A does not give test of

F e^{2 +}

C N^{-}

. It is due to formation of________ .

Q. Assertion :Transition metal ion forming octahedral complexes undergo

s p^{3} d^{2}

d^{2} s p^{3}

hybridisation. Reason: Strong field ligands force the unpaired electrons of central metal ion to pair up causing

d^{2} s p^{3}

hybridisation whereas weak field ligands do not affect electronic configuration of the metal ion undergoes in

s p^{3} d^{2}

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