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CFSE Comparison

Identify the ...

Question

Identify the correct trend given below :
(Atomic No. of Ti = 22, Cr = 24 and Mo = 42)

A

Δ_{o}

of

[C r (H_{2} O)_{6}]^{2 +} > [M o (H_{2} O)_{6}]^{2 +}

and

Δ_{o}

of

[T i (H_{2} O)_{6}]^{3 +} > [T i (H_{2} O)_{6}]^{2 +}

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B

Δ_{o}

of

[C r (H_{2} O)_{6}]^{2 +} < [M o (H_{2} O)_{6}]^{2 +}

and

Δ_{o}

of

[T i (H_{2} O)_{6}]^{3 +} < [T i (H_{2} O)_{6}]^{2 +}

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C

Δ_{o}

of

[C r (H_{2} O)_{6}]^{2 +} < [M o (H_{2} O)_{6}]^{2 +}

and

Δ_{o}

of

[T i (H_{2} O)_{6}]^{3 +} > [T i (H_{2} O)_{6}]^{2 +}

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D

Δ_{o}

of

[C r (H_{2} O)_{6}]^{2 +} > [M o (H_{2} O)_{6}]^{2 +}

and

Δ_{o}

of

[T i (H_{2} O)_{6}]^{3 +} > [T i (H_{2} O)_{6}]^{2 +}

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Solution

The correct option is A $Δ_{o}$ of $[C r (H_{2} O)_{6}]^{2 +} > [M o (H_{2} O)_{6}]^{2 +}$ and $Δ_{o}$ of $[T i (H_{2} O)_{6}]^{3 +} > [T i (H_{2} O)_{6}]^{2 +}$

The crystal field splitting energy, $Δ_{o} \propto \frac{C h a r g e o n m e t a l i o n}{s i z e o f m e t a l i o n}$

Considering both the factors we get-

$Δ_{o}$ of $[C r (H_{2} O)_{6}]^{2 +} > [M o (H_{2} O)_{6}]^{2 +}$ and $Δ_{o}$ of $[T i (H_{2} O)_{6}]^{3 +} > [T i (H_{2} O)_{6}]^{2 +}$

Hence, the correct option is $(A)$

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Similar questions

Q. Among the complex ions

[T i (H_{2} O)_{6}]^{3 +}, [C r (H_{2} O)_{6}]^{2 +}, [F e (H_{2} O)_{6}]^{2 +}

[C o (H_{2} O)_{6}]^{2 +}

, the one that shows strongest distortion from regular octahedral structure is:

Q. Magnetic moment of

[T i (H_{2} O)_{6}]^{4 +}, [M n (H_{2} O)_{6}]^{2 +}

[C r (H_{2} O)_{6}]^{3 +}

can be represented as

X, Y

Z

. They are in order of:

Q. Predict the order of

Δ_{o}

for the following compounds:-
(i)

[C r (H_{2} O)_{6}]^{3 +}

[C r (C N)_{2} (H_{2} O)_{4}]^{-}

[C r (C N)_{4} (H_{2} O)_{2}]^{-}

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

The absorption maxima of some complexions are as follows:

$[C r C l_{6}]^{3 -} - 760 n m$

$[C r (N H_{3})_{6}]^{3 +} - 470 n m$

$[C r (H_{2} O)_{6}]^{3 +} - 695 n m$

The order of $Δ_{o}$ for these ions is

C r^{3 +}

form four complexes with four different ligands which are

[C r (C l)_{6}]^{3 -}, [C r (H_{2} O)_{6}]^{3 +}, [C r (N H_{3})_{6}]^{3 +}

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

. The order of CFSE

(Δ_{o})

in these complexes is in the order :

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