Exam

JEE Advanced

Year

2011

Paper

Paper 1

Subject

Chemistry

Chapter

Coordination Compounds

JEE Advanced 2011 · Paper 1 · Chemistry · Coordination Compounds

Geometrical shapes of the complexes formed by the reaction of Ni^...

Geometrical shapes of the complexes formed by the reaction of $\mathrm{Ni}^{2+}$ with $\mathrm{Cl}^{-}$, $\mathrm{CN}^{-}$and $\mathrm{H}_2 \mathrm{O}$, respectively, are

Step-by-step solution

$\mathrm{Ni}^{2+}+$4 \mathrm{CN}^{-} \longrightarrow\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-} $\text{. Here } \mathrm{Ni}^{2+} \text{ has }$d^8 $\text{ configuration with } \mathrm{CN}^{-} \text{as strong ligand. }<img src="/api/proxy-image?url=https$ \\ $d^8$-configuration in strong ligand field gives $d s p^2$-hybridisation, hence square planar geometry. $\mathrm{Ni}^{2+}+$4 \mathrm{Cl}^{-} \longrightarrow\left[\mathrm{NiCl}}_{4}\right]^{2-} Here \mathrm{Ni}^{2+} hadd^8$-configuration with \mathrm{Cl}^{-}as weak ligand.$$\\$d^8$-configuration in weak ligand field gives$s p³$hydridisation, hence tetrahedral geometry. \mathrm{Ni}^{2+} with \mathrm{H}_2 \mathrm{O} forms \left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} complex and \mathrm{H}_2 \mathrm{O} is a weak ligand.$\\ \text{ Therefore, } \mathrm{Ni}\left(\mathrm{H}}_{2} \mathrm{O}\right)^{2+} \text{ has octahedral geometry. }