When KCl is heated in an atmosphere of K vapo | vedclass

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Question

(A) When $KCl$ is heated in an atmosphere of $K$ vapor,excess $K$ atoms deposit on the surface of the crystal. $Cl^-$ ions diffuse to the surface and

Vedclass · Accepted Answer

Electrons enter the crystal and occupy the vacancies created by $Cl^-$ ions.

Vedclass · Answer

(A) When $KCl$ is heated in an atmosphere of $K$ vapor,excess $K$ atoms deposit on the surface of the crystal. $Cl^-$ ions diffuse to the surface and combine with $K$ atoms to form $KCl$. This process releases electrons,which diffuse into the crystal and occupy the anionic vacancies (holes) left by $Cl^-$ ions. These trapped electrons are known as $F$-centers (from the German word $Farbenzentrum$,meaning color center),which absorb light from the visible region and impart a violet color to the $KCl$ crystal.

When $KCl$ is heated in an atmosphere of $K$ vapor,it appears violet. This is because .................

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