An excess of potassium ions makes KCl

Question:

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

since ________.

(i) some of the anionic sites are occupied by an unpaired electron.

(ii) some of the anionic sites are occupied by a pair of electrons.

(iii) there are vacancies at some anionic sites.

(iv) F-centres are created which impart colour to the crystals.

 

Solution:

Option (i) and (iv) are the answers.

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