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Question

Select correct statement(s) regarding given complexes :

A
[Fe(CO)5], the orbitals used for hybridization in Fe atom are s,px,py,pz,dz2 and it is high spin complex
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B
[Pt(NH3)2Cl2], the orbitals used for hybridization on Pt atom are s,px,py,dx2y2 and it is low spin complex
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C
[Cr(H2O)6]3+, the orbitals used for hybridization in Cr atom are s,px,py,pz,px2,dx2y2 and it is high spin complex
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D
Ni(CO)4, the orbitals used for hybridization in Ni atom are, s,px,py,pz, and it is low spin complex
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Solution

The correct option is D Ni(CO)4, the orbitals used for hybridization in Ni atom are, s,px,py,pz, and it is low spin complex

(A) [Fe(CO)5] involves dsp3 hybridization. The orbitals involved are dz2,s,px,pyandpz
It is low spin complex. Thus option A is incorrect.
(B) [Pt(NH3)2Cl2] undergoes dsp2 hybridization to form high spin complex. The orbitals involved in the hybridization are s,px,py,dx2y2.
(C) In [Cr(H2O)6]3+, the Cr3+(d3) ion undergoes sp3d2 hybridization to form outer orbital complex with 3 unpaired electrons.
The orbitals involved in the hybridization are s,px,py,pz,dx2,dx2y2
Thus option C is incorrect.
(D) Ni(CO)4 involves sp3 hybridization to form low spin complex. The orbitals involved in the hybridization are s,px,py,pz.
Thus option D is correct.
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