Which one of the following complexes has largest value of $Δ_{0}$ ?

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

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

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[M n (H_{2} O)_{6}]^{+ 2}

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[M n (H_{2} O)_{6}]^{+ 3}

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Solution

The correct option is A $[C r (H_{2} O)_{6}]^{+ 3}$
The value of $△_{o}$ increases with increase in oxidation state of central metal, since maximum charges causes more left and hence orbital contracts lead to more $C F S E (△_{o})$
$c r^{3 +} \to t_{2 g}^{3} e g^{o} \to C F S E = | - 6 / 5 | △_{o}$
$M n^{3 +} \to d^{4} \to t_{2} g^{3} e g^{1} \to C F S E = - 6 / 5 △_{o} + 3 / 5 △_{o} = | - 3 / 5 | △_{o}$
$∴ △_{o} = c r^{3 +} > M n^{3 +}$

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Similar questions

Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?
(Atomic number Cr = 24, Mn = 25, Fe = 26, Ni = 28)

The $d$ electron configuration of $C r^{2 +}, M n^{2 +}, F e^{2 +}$ and $N i^{2 +}$ are $3 d^{4}, 3 d^{5}, 3 d^{6}$ and $3 d^{8}$ respectively. Which one of the following aqua complexes will exhibit the maximum paramagnetic behaviour?

Q. Magnetic moment of

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

and

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

can be represented as

X, Y

and

Z

. They are in order of:

Q. The

d -

electronic configuration of

C r^{2 +}, M n^{2 +}, F e^{2 +}

and

N i^{2 +}

are

3 d^{4}, 3 d^{5}, 3 d^{6}

and

3 d^{8}

respectively, which one of the following aqua-complex will exhibit the minimum paramagnetic behaviour?

The pair having the same magnetic moment is:

[At. No $∴$ Cr =24, Mn =25, Fe =26, Co =27]

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Which one of the following complexes has largest value of Δ0?

Which one of the following complexes has largest value of $Δ_{0}$ ?