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Explain why Chromate and dichromate anions are colored.

Explain why Chromate and dichromate anions are colored.

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Answer #1

oxidation state of Cr in chromate [CrO4]2- is +6

if you write the electronic configuration d orbitals in Cr does not have electrons

The color is due to what is known as ligand to metal charge transfer (LMCT) an electron from a lone pair on an

oxygen absorbs a photon and is promoted to an empty d orbital on Cr

These transitions are strongly allowed, but the maximum of the absorption is in the UV and only part of the

absorption band tails into the violet/blue region of the visible spectrum and we see the complementary color of

yellow

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