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Byju's Answer

Standard XII

Chemistry

Anomalous Behaviour of Fluorine

Which one of ...

Question

Which one of the following complexes is an outer orbital complex?

[F e (C N)_{6}]^{4 -}

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[M n (C N)_{6}]^{4 -}

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[C o (N H_{3})_{6}]^{3 +}

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[N i (N H_{3})_{6}]^{2 +}

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Solution

The correct option is C $[N i (N H_{3})_{6}]^{2 +}$
Option (D) is correct.

In $[$ Ni $(N H_{3})_{6}]^{2 +}$ complex, the oxidation state of $N i$ in the complex is $+ 2$

$N i$ has outer electronic configuration of $4 s^{2}, 3 d^{8}$ therefore, $N i^{2 +}$ has outer electronic configuration of $4 s^{0}, 3 d^{8}$ .

Electrons are always removed from the $4 s$ atomic orbital first. Ammonia is a weaker ligand so inner electrons do not pair up.

This results in $s p^{3} d^{2}$ hybridisation and formation of outer orbital complex.

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Similar questions

Q. Explain

[C o (N H_{3})_{6}]^{3 +}

is an inner orbital complex whereas

[N i (N H_{3})_{6}]^{2 +}

is an outer orbital complex.

Atomic number of Mn. Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamangetic?
(a) $[C o (N H_{3})_{6}]^{3 +}$
(b) $[M n (C N)_{6}]^{3 -}$
(c) $[F e (C N)_{6}]^{4 -}$
(d) $[F e (C N)_{6}]^{3 -}$

Q. How many in each of the following complexes obey the rule of

18

(EAN rule)?

(a)

[C u (N H_{3})_{4}]^{2 +}, [C u (e n)_{3}]^{2 +}, [C u (C N)_{4}]^{3 -}

(b)

[F e (C N)_{6}]^{4 -}, [F e (C N)_{6}]^{3 -}, F e (C O)_{6}

(c)

[N i (N H_{3})_{6}]^{2 +}, [N i (C N)_{4}]^{2 -}, [N i (C O)_{4}]

(d)

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

(e)

[C o (N H_{3})_{6}]^{3 +}, [C o C l_{4}]^{2 -}

Q. Which one is more stable in the following pairs of complexes? Give reasons.
i)

[C o (N O_{2})_{6}]^{4 -}

and

[C o (N O_{2})_{6}]^{3 -}

ii)

K_{4} [F e (C N)_{6}]

and

K_{3} [F e (C N)_{6}]

.
(iii)

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

and

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

Using valence bond theory, explain the following in relation to the complexes given below
$[M n (C N)_{6}]^{3 -}, [C o (N H_{3})_{6}]^{3 +}, [C r (H_{2} O)_{6}]^{3 +}, [F e C l_{6}]^{4 -}$
(a) Type of hybridisation
(b) Inner or outer orbital
(c) Magnetic behaviour
(d) Spin only magnetic moment value.

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