The complex ion which has no d-electrons in the central metal atom is:

[M n O_{4}]^{-}

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

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

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

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Solution

The correct option is C $[M n O_{4}]^{-}$
The oxidation state of Mn in $[M n O_{4}]^{-}$ = +7, hence it does not have any d - electron present in it.
The electronic configuration of $M n = [A r] 3 d^{5} 4 s^{2}$ .
The electronic configuration of $M n^{+ 7} = [A r] 3 d^{0} 4 s^{0}$ .
The electronic configuration of $C o^{+ 3} = [A r] 3 d^{6} 4 s^{0}$ .
The electronic configuration of $F e^{+ 3} = [A r] 3 d^{5} 4 s^{0}$ .
The electronic configuration of $C r^{+ 3} = [A r] 3 d^{3} 4 s^{0}$ .

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Similar questions

Q. The complex ion which has no

^{'} d^{'}

electrons in the central metal atom is:

Q. Which complex ion has no

d

-electron in the central metal atom?

Q. The complex ion which has no d electrons in the central metal atom is: (At no.

C r = 24, M n = 25, F e = 26, C o = 27

)

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. For the complex ion

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

, state:
(i) the type of hybridisation.
(ii) the magnetic behaviour.
(iii) the oxidation number of the central metal atom.

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