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An excess of potassium ions makes KCl cr...

An excess of potassium ions makes KCl crystals appear violet or lilac in colour since

A

some of the anionic sites are occupied by an unpaired electrons

B

some of the anionic sites are occupied by a pair of electrons

C

there are vacancies at some anionic sites.

D

F-centres are created which impart colour the crystals.

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MODERN PUBLICATION-SOLID STATE-EXERCISE
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  11. Which of the following defects decrease the density?

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