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  4. Nickel (Z = 28) combines with a uninegative monodentate ligand X- to form a paramagnetic complex [NiX4]2-. The number of unpaired electron(s) in the nickel and geometry of this complex ion are respectively:

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Q. Nickel (Z = 28) combines with a uninegative monodentate ligand $X^-$ to form a paramagnetic complex $[NiX_4]^{2-}$. The number of unpaired electron(s) in the nickel and geometry of this complex ion are respectively:

AIEEEAIEEE 2006Coordination Compounds

Solution:

Nickel has two unpaired electrons and geometry is tetrahedral due to $sp^3$ hybridisation.

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