The orange colour of $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and purple colour of $\mathrm{KMnO}_4

Question

The orange colour of $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and purple colour of $\mathrm{KMnO}_4$ is due to

Professor PC Thomas Classes · Answer

Both $K_2Cr_2O_7$ and $KMnO_4$ have metal ions in $d^0$ configurations; intense colors arise strictly from Ligand-to-Metal Charge Transfer (LMCT).