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JEE Advanced levelSingle correct optionDifficulty 3 of 3cc108

A nickel(II) complex $[NiX X_{2} L X_{2}]$ (X = halide, L = phosphine) exists in only one isomeric form and has a spin-only moment of 2.83 BM. The geometry and hybridisation are

Asquare planar, $d s p^{2}$
Boctahedral, $s p^{3} d^{2}$
Csquare planar, $s p^{3}$
Dtetrahedral, $s p^{3}$

Answer: D

Ni(II) is

d^{8}

. Square planar

d^{8}

is diamagnetic and

[NiX X_{2} L X_{2}]

would show cis and trans isomers. A single form with 2 unpaired electrons (

8 = 2.83

) means a tetrahedral complex with

s p^{3}

hybridisation, as all positions in a tetrahedron are equivalent.

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