Potassium dichromate is an orange colour crystal and is an important compound used as an oxidant in many reactions How will you account for the colour of potassium dichromate crystals?

Explanation

Orange colour of dichromate ion and potassium dichromate is due to charge transfer (i.e., momentary transfer of charge from oxygen to metal). It is not,due to d-d transition because `Cr^(+6)` does not contain any electron in tZ-orbital.