Single Choice

Geometrical shapes of the complexes formed by the reaction of $$Ni^{2+}$$ with $$Cl^{-},\ CN^{-}$$ and $$H_{2}O$$, respectively, are:

Aoctahedral, tetrahedral and square planar
Btetrahedral, square planar and octahedral
Correct Answer
Csquare planar, tetrahedral and octahedral
Doctahedral, square planar and octahedral

Solution

$$Ni^{2+}+4Cl^-\rightarrow [NiCl_4]^{2-}$$

$$[NiCl_4]^{2-}=3d^8;\ Cl^-$$ being weak ligand doesn't compel (configuration $$sp^3)$$ for the pairing of electrons.
Hence, the complex has a tetrahedral geometry.

$$[Ni(CN)_4]^{2-}\rightarrow 3d^8$$ configuration. $$(CN)^-$$ being strong ligand compel for the pairing of the electrons. Hence, square planar geometry.

$$Ni^{2+}+6H_2O\rightarrow [Ni(H_2O)_6]^{2+}$$

$$[Ni(H_2O)_6]^{2+}\rightarrow 3d^8$$ configuration. As with $$3d^8$$ configuration, two orbitals are not available for $$d^2sp^3$$ hybridisation.
So, it will have octahedral geometry.

Hence, option $$B$$ is correct.

SIMILAR QUESTIONS

Coordination Compounds

The extent of crystal field splitting in octahedral complex of the given metal with particular weak field ligand are such that :

Coordination Compounds

Define crystal field splitting energy.

Coordination Compounds

On the basis of crystal field theory, write the electronic configuration for $$d^{4}$$ ion, if $$\Delta_0 > P$$

Coordination Compounds

The complex that has the highest crystal splitting energy $$(\Delta)$$, is:

Coordination Compounds

A metal ion $$M^{n+}$$ having $$d^4$$ valence electronic configuration combines with three bidentate ligands to form a compound. Assuming $$\Delta_0 > P$$: Explain orbital splitting during this complex formation.

Coordination Compounds

Geometrical shapes of the complexes formed by the reaction of $$Ni^{2+}$$ with $$Cl^{-},\ CN^{-}$$ and $$H_{2}O$$, respectively, are:

Coordination Compounds

Select the correct order of magnetic moment (in B.M.) from the following options :

Coordination Compounds

The increasing order of the crystal field splitting power of some common ligands is?

Coordination Compounds

In which of the following complexes of the Co (atomic no. $$=27$$), will the magnitude of $$\Delta_o$$ be the highest?

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