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In which of the following species is the observed colour not due to a d–d electronic transition?

1. Cr2O7²−
2. CrO4²−
3. CrO2Cl2
4. All of these

Correct answer: All of these

Solution

In Cr2O7^2-, CrO4^2-, and CrO2Cl2 chromium is in the +6 state (d0), so there are no d electrons for d-d transitions. Their colour arises from ligand-to-metal charge transfer, so 'All of these' is correct.

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