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  • Which one of the following complexes is an outer orbital complex?Option: 1 <img alt="\mathrm{\left[F e(C N)_{6}\right]^{4-}}" src="https://entranceco

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

Option: 1

\mathrm{\left[F e(C N)_{6}\right]^{4-}}


Option: 2

\mathrm{\left[\operatorname{Mn}(C N)_{6}\right]^{4-}}


Option: 3

\mathrm{\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}}


Option: 4

\mathrm{\left[N i\left( NH _{3}\right)_{6}\right]^{2+}}


Answers (1)

best_answer

As we have learnt,

Electronic configuration of \mathrm{Fe^2^+: [Ar]3d^6} 

With a strong field ligand which causes pairing, the hybridisation will be \mathrm{d^2sp^3}

-

Electronic configuration of \mathrm{Mn^2^+: [Ar]3d^5}

With a strong field ligand which causes pairing, the hybridisation will be \mathrm{d^2sp^3}

-

Electronic configuration of \mathrm{Co^3^+: [Ar]3d^6}

With a strong field ligand which causes pairing, the hybridisation will be \mathrm{d^2sp^3}

-

Electronic configuration of \mathrm{Ni^2^+: [Ar]3d^8}

Irrespective of the strength of the ligand, the hybiridisation will be \mathrm{sp^3d^2}

Hence, among the given complexes, the outer orbital complex is \mathrm{[Ni(NH_3)_6]^{2+}}

Therefore, option (4) is correct.

Posted by

shivangi.shekhar

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