Question

C) kcl crystal is colourless. But on heating it in an atmosphere of potassium vapour, it becomes violet in colour. Account for this.

Answer 1

Explanation:

occurs because of the metal excess defect due to anionic vacancies

Answer 2

Answer

F-centre,which will results in the Chloride anion vacancy created

Explanation:

KCl crystal is colourless . But on heating it in an atmosphere of potassium vapour ,it becomes violet in colour.

It happens ,due to the formation of F-centre,which will results in the Chloride anion vacancy created, electron becomes excited and when they come to ground state they radiate energy in visible region, upon heating KCl in excess of K vapours.

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