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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 ) one, square planar
( B ) one, tetrahedral
( C ) two, tetrahedral
( D ) two, square planar

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