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Question

Consider following complexes :

I: [Fe(H2O)6]2+
II :[Fe(CN)6]4−
III :[Ni(CO)4]
IV :[Ni(H2O)4]2+
V :[Ni(CN)4]2−

Out of this, select the complexes with octahedral geometry :

A
[Fe(H2O)6]2+
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B
[Fe(CN)6]4
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C
[Ni(H2O)4]2+
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D
[Ni(CN)4]2
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Solution

The correct options are
A [Fe(CN)6]4
C [Fe(H2O)6]2+
The complexes, [Fe(H2O)6]2+ and [Fe(CN)6]4 have octahedral geometry.

The central iron atom undergoes sp3d2 hybridization in [Fe(H2O)6]2+. It results in outer orbital complex or high spin complex.

The central iron atom undergoes d2sp3 hybridization in [Fe(CN)6]4. It results in outer orbital complex or high spin complex.

Therefore, option A and B both are correct.

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