SATHEE: Coordination Compounds 2 Question 20

Coordination Compounds 2 Question 20

####22. The complex that has highest crystal field splitting energy $(Δ)$ , is

(a) $[C o {(N H_{3})}_{5} C l] C l_{2}$

(b) $[C o {(N H_{3})}_{5} (H_{2} O)] C l_{3}$

(d) $K_{2} [C o C l_{4}]$

(2019 Main, 9 Jan II)

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Answer:

Correct Answer: 22. (c)

Solution:

All of the complex given are the octahedral complexes of Co (III) except $K_{2} [C o C l_{4}]$ , which is a tetrahedral complex of $C o$ (II) ( $s p^{3}$ -hybridised).

We know,

$Δ_{t} < Δ_{o}$

$[∵ Δ_{t} = \frac{4}{9} Δ_{o}]$

So, the octahedral complexes $(a, b, c)$ have higher $Δ_{o}$ values than that of tetrahedral, $K_{2} [C o C l_{4}]$ .

Now, for the complexes, $a, b$ and $c$ ,

the magnitude of $Δ_{o} \propto$ ligand strength, which is based on their positions in the spectrochemical series.

$C l^{-} < H_{2} O < N H_{3} < C N^{-}$

Hence, $K_{3} [C o (C N)_{6}]$ will have the highest $Δ$ value.

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Coordination Compounds 2 Question 20

Answer:

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