Statement: The characteristic spectroscopic feature of the quadruply bonded $\left[\mathrm{Re}_{2} \mathrm{Cl}_{8}\right]^{2-}$ is a strong royal blue colourReason: This is due to an absorption band in the visible region due to excitation of an electron from $\sigma^{2} \pi^{4} \delta^{2}$ ground state to $\sigma^{2} \pi^{4} \delta^{1} \delta^{* 1}$ excited stateAssertion: This transition is quantum mechanically allowed.