Question

The appearance of lilac colour in KCl crystals is due to
Excess of K and missing Crions
Excess of both ki and clions
Missing of K and excess of crions
Missing of both ki and cr ions​

Answer 1

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

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Answer 2

Answer:

When KC1 is heated in vapour of K, some of the Cl leave their lattice site and create anion vacancies. This chloride ion wants to combine with K vapour to form potassium chloride. For doing so K atom loses electrons form K ions. This released electron diffuses into the crystal to get entrapped in the anion vacancy called F-centre. When visible light falls on the crystal, this entrapped electron gains energy, goes to the higher level when it comes back to the ground state, energy is released in the form of light.