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Q.

All the following exhibit colour due to charge transfer phenomenon except

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a

K2MnO4

b

KMnO4

c

K2CrO4

d

K2Cr2O7

answer is A.

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Detailed Solution

(1) M+6nO4-2. . . d1 . . .  colour due to d-d- transitions.(2) M+7nO4-. . . do . . .  colour due to charge transfer.(3) C+6rO4-2. . . do . . .  colour due to charge transfer.(4) C+6r2O7-2. . . do . . .  colour due to charge transfer.
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