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Q.

An excess of potassium ions makes KCI crystals to appear violet or lilac in colour since….

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a

some of the anionic sites are occupied by an unpaired electron

b

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

c

there are vacancies at some anionic sites

d

F- centers are created which impart colour to the crystals

answer is C.

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Detailed Solution

When KCl crystals are heated,it1eadstothedepositionof potassium ion on the surface of KCl. The Cl- ions diffuse to the surface of crystal and loss of electron convert potassium atom in to K+ ion. The released electron occupies anionic site which is known as .F- centre and impart colour to the crystal.
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