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IIT-JEE 2011 · Paper 1, Chemistry question 2

Geometrical shapes of the complexes formed by the reaction of NiX2+\ce{Ni^{2+}} with ClX−\ce{Cl-}, CNX−\ce{CN-} and HX2O\ce{H2O}, respectively, are

Choose one option
Answer and worked solution

Official answer: B

Ni²⁺ (d⁸).

  • Cl⁻ (weak field, large): [NiClX4]X2−\ce{[NiCl4]^{2-}}, tetrahedral.
  • CN⁻ (strong field): [Ni(CN)X4]X2−\ce{[Ni(CN)4]^{2-}}, dsp² square planar.
  • H₂O: [Ni(HX2O)X6]X2+\ce{[Ni(H2O)6]^{2+}}, octahedral.

(B)

Topics:Valence bond theoryCrystal field theory
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