Statement - I : A compound having metal excess defect due to anionic vacancies exhibit colour
Statement - II : At F-centres electrons get excited by absorbing light in visible region.

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Both statements I and II are correct

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

Statement-I is correct and statement-II is incorrect

answer is A.

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Detailed Solution

In metal excess defect, the anionic sites are occupied by unpaired electrons are called F-centres (from the German word Farbenzenter for color centre).
They impart colour to the solid crystals.
The colour results by the excitation of these electrons when they absorb energy from the visible light falling on the crystals.

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