The colour of potassium dichromate is due to

Question

The colour of potassium dichromate is due to (A) d-d transition (B) transition in K+ ion (C) ligand-to-metal charge transfer (D) metal to ligand charge transfer

Tardigrade Admin · Accepted Answer

Theorange color of dichromate is due to charge (electron) transfer from O2 - ligands to the empty d-orbitals of the central metal Cr6 + , i.e. LMCT. This electronic transfer absorbs greenish blue light and leaves the complimentary orange light behind as the observed colour.

Q. The colour of potassium dichromate is due to

d-d transition

transition in $K^{+}$ ion

ligand-to-metal charge transfer

metal to ligand charge transfer

Theorange color of dichromate is due to charge (electron) transfer from $O^{2 -}$ ligands to the empty d-orbitals of the central metal $C r^{6 +}$ , i.e. LMCT. This electronic transfer absorbs greenish blue light and leaves the complimentary orange light behind as the observed colour.