Coordination Compounds

Correct increasing order for the wavelength of absorption in the visible region for the complexes of $\mathrm{Co}^{3+}$ is

Which of the following complex is optically inactive?

Which of the following is a pair of diamagnetic complexes?

Assertion : In Zeise's salt coordination number of $\mathrm{Pt}$ is five. Reason : Ethene is a bidentate ligand.

Which of the following can be reduced easily?

Assertion : $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ has $d^2 s p^3$ type hybridisation. Reason: $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ ion shows magnetic moment corresponding to two unpaired electrons.

Among the following, the compound that is both paramagnetic and coloured is

Assertion : $\mathrm{Co}\left[\mathrm{Hg}(\mathrm{SCN})_6\right]$ and $\mathrm{Hg}\left[\mathrm{Co}(\mathrm{SCN})_6\right]$ are isomers. Reason : $\mathrm{SCN}^{-}$is a stronger ligand as compared to $\mathrm{NCS}^{-}$.

Amongst the following, the most stable complex is

The diamagnetic species is

Assertion: Linkage isomerism arises in coordination compounds containing ambidentate ligand. Reason: Ambidentate ligand has two different donor atoms.

Least coordination number is shown by