Which of the following compounds are coloured due to charge transfer?
$K M n O_{4}, K_{2} C r_{2} O_{4}, K_{2} C r O_{4}, C r O_{2} C l_{2}, H g I_{2}, B i I_{3}, P b I_{2}$

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Solution

$M n^{+ 7}, and C r^{+ 6}$ have no d electrons and hence there is no d-d transition. But the color of the complexes is due to ligand to metal charge transfer.

$H g I_{2}$ , $B i I_{3}$ and $P b I_{2}$ are also colored due to ligand metal charge transfer . Here, $I$ has greater tendency to donate electrons tofacilitate charge transfer.

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