Kcl crystal is colourless . But on heating it in an atmosphere of pott

1.	Kcl crystal is colourless . But on heating it in an atmosphere of pottasium vapour it become violet in colour . Account for this
Answer» Answer: Due to the presence of F-centres Explanation: When KCl is heated with small amount of K, at first the K atoms lose ONE electron and forms K+ ions. Again some of the Cl- from the LATTICE sites moves towards the SURFACE creating some holes INSIDE. The negative electrons from the surface occupy the emplty ANIONIC sites which are called F-centres. Due to these F centres it imparts colour

Kcl crystal is colourless . But on heating it in an atmosphere of pottasium vapour it become violet in colour . Account for this

Answer»

Answer:

Due to the presence of F-centres

Explanation:

When KCl is heated with small amount of K, at first the K atoms lose ONE electron and forms K+ ions. Again some of the Cl- from the LATTICE sites moves towards the SURFACE creating some holes INSIDE. The negative electrons from the surface occupy the emplty ANIONIC sites which are called F-centres. Due to these F centres it imparts colour

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Kcl crystal is colourless . But on heating it in an atmosphere of pottasium vapour it become violet in colour . Account for this

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