Q.

Which one of the following is coloured due to d-d- transitions

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a

KMnO4

b

K2CrO4

c

K2Cr2O7

d

K2MnO4

answer is D.

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Detailed Solution

Mn+7(KMnO4), Cr+6(K2CrO4,K2Cr2O7) have do configuration. Colour in these compounds is due to charge transfer phenominon (L→M). Mn+6(K2MnO4) has d1 configuration. It shows colour due to d-d transitions.
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