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There is no d-d transition in Cu^(+) but...

There is no `d-d` transition in `Cu^(+)` but `Cu_(2)O` is coloured due to

A

The presence of unpaired electron

B

The presence of coloured `O^(2-)` ion

C

Charge transfer from oxygen to metal

D

Charge transfer from metal to oxygen

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The correct Answer is:
C
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