Which one of the following complexes is an outer orbital complex?
[Atomic numbers: Mn= 25, Fe= 26, Co= 27, Ni= 28]

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${[Mn (CN)_{6}]}^{4}$

${[Fe (CN)_{6}]}^{4 -}$

${[Co {({NH}_{3})}_{6}]}^{3 +}$

${[Ni {({NH}_{3})}_{6}]}^{2 +}$

answer is D.

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Detailed Solution

Outer orbital complexes are coordination compounds composed of a central metal atom having hybridization of the atomic orbitals including s, p and d orbitals from the outermost shell.

We have

Thus, ${[Ni {({NH}_{3})}_{6}]}^{2 +}$ + involves outer orbital complexation.

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