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Q.

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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a

Both statements I and II are correct

b

Statement-I is incorrect and statement-II is correct

c

Both statements I and II are incorrect

d

Statement-I is correct and statement-II is incorrect

answer is A.

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Detailed Solution

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  • 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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