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Q.

The colour of $K_{2} C r_{2} O_{7}$ is due to

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a

Crystal defects

b

d-d transion

c

Presence of unpaired electrons

d

Charge transfer phenomena

answer is A.

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Detailed Solution

Due to charge transfer phenomena $K_{2} C r_{2} O_{7}$ exhibits colour. (Orange red)

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The colour of K2Cr2O7 is due to