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Which one of the following complexes is an outer orbital complex? (a) [Fe(CN)6]^4–

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Which one of the following complexes is an outer orbital complex?
(a) [Fe(CN)6]4– 

(b) [Mn(CN)6]4–

(c) [Co(NH3)6]3+ 

(d) [Ni(NH3)6]2+.
[Atomic nos.: Mn = 25, Fe = 26, Co = 27, Ni = 28]

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Best answer

Correct option(d) [Ni(NH3)6]2+.

Explanation:

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