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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 tetrahedral geometry :

A
[Fe(CN)6]4
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B
[Ni(CO)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
B [Ni(CO)4]
C [Ni(H2O)4]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.
[Ni(CO)4] and [Ni(H2O)4]2+ have tetrahedral geometry due to sp3 hybridisation.

[Ni(CN)4]2 has square planar geometry due to dsp2 hybridization.

Therefore, option B and C both are correct.

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