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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

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 .................

Similar Questions

Which one of the following crystals does not exhibit Frenkel defect?

If $NaCl$ is doped with $10^{-4} \ mol \%$ of $SrCl_2,$ the concentration of cation vacancies will be $(N_A = 6.02 \times 10^{23} \ mol^{-1}).$

State the types of point defects.

Among the following solids,Schottky defect is $NOT$ observed in-

Analysis shows that nickel oxide has the formula $Ni_{0.98}O_{1.00}$. What fractions of nickel exist as $Ni^{2+}$ and $Ni^{3+}$ ions?

Vedclass Test Series

Exam Paper Generator

Online Exam Module