Coordination Compounds · Chemistry · Class 12

In the two tetrahedral structures of dichromate ion

The magnetic moment of $$\left[\mathrm{NiCl}_4\right]^{2-}$$

[Atomic number : $$\mathrm{Ni}=28$$ ]

Assertion (A): Trans $$\left[\mathrm{Cr} \mathrm{Cl}_2(\mathrm{ox})_2\right]^{3-}$$ shows optical isomerism.

Reason (R): Optical isomerism is common in octahedral complexes involving bidentate ligands.

(a) Which of the following species cannot act as a ligand? Give reason.

$$\mathrm{OH}^{-}, \mathrm{NH}_4^{+}, \mathrm{CH}_3 \mathrm{NH}_2, \mathrm{H}_2 \mathrm{O}$$

(b) The complex $$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{NO}_2\right)\right] \mathrm{Cl}_2$$ is red in colour. Give IUPAC name of its linkage isomer.

(a) On the basic of crystal field theory write the electronic configuration for $$\mathrm{d}^5$$ ion with a strong field ligand for which $$\Delta_0>\mathrm{P}$$.

(b) $$\left[\mathrm{Ni}(\mathrm{CO})_4\right]$$ has tetrahedral geometry while $$\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$$ has square planar yet both exhibit diamagnetism. Explain.

[Atomic number : $$\mathrm{Ni}=28$$ ]