Coordination CompoundMedium
Question
The compounds containing complex oxyanion CrO42- are intensely yellow coloured be cause
Options
A.Chromium ion in CrO42- is a transition metal ion
B.Cr and O are π - bonded and the allowed π → π* transition for yellow colour
C.Cr → O change transfer is responsible for yellow colour
D.Compounds have strong absorption at ~ 640nm
Solution
Chromium is in VI oxidation state in CrO42- ion and therefore, it has no unpaired electron in its d-orbital. However, due to charge transfer Cr → O this ion shows intense yellow colour.
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