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Nickel (Z = 28) combines with a uninegat...

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

A

two, tetrahedral

B

one, square planar

C

two, square planar

D

one, tetrahedral

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