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Q.

(A) Nickel combines with a negative mono-dentate ligand X to form a paramagnetic complex ${[{NiX}_{4}]}^{2 -}$ ^.
(R) The number of unpaired electron/s in the nickel and the geometry of this complex ion respectively.

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a

one, tetrahedral

b

one, square planar

c

two, tetrahedral

d

two, square planar

answer is C.

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Detailed Solution

In [NiX₄]^2–3d⁸4s²is Ni electronic configuration.

3d⁸4s⁰ is Ni²⁺ electronic configuration.

2 unpaired electrons will remain unpaired in the paramagnetic complex.

Thus sp³ is the hybridization.

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(A) Nickel combines with a negative mono-dentate ligand X to form a paramagnetic complex[NiX4]2-. (R) The number of unpaired electron/s in the nickel and the geometry of this complex ion respectively.