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IMPORTANT
Earn 100

An excess of potassium ions make crystals appear violet or lilac in colour since
(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)the F-centres are created, which impart the colour to the crystals.

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