NaCl is heated in an atmosphere of sodium vap | vedclass

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(C) Anion vacancies in alkali halides are produced by heating the alkali halide crystals in an atmosphere of the alkali metal vapour. When the metal a

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$F$-centers

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(C) Anion vacancies in alkali halides are produced by heating the alkali halide crystals in an atmosphere of the alkali metal vapour. When the metal atoms deposit on the surface, they diffuse into the crystal. After ionization, the alkali metal ion occupies cationic vacancies, whereas the electron occupies the anionic vacancy. Electrons trapped in anion vacancies are referred to as $F$-centers, which give rise to the characteristic yellow colour in $NaCl$ crystals.

List-$I$ (Defect)	List-$II$ (Examples)
$A$. Frenkel defects	$1$. $FeO$
$B$. Schottky defects	$2$. $NaCl$
$C$. Vacancy defects	$3$. $AgCl$
$D$. Metal deficiency defects	$4$. Crystals with vacant lattice sites

$NaCl$ is heated in an atmosphere of sodium vapour. The resultant yellow colour is due to the formation of

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Explain the following term with a suitable example:
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Match List-$I$ with List-$II$.

List-$I$ (Defect) List-$II$ (Examples)

$A$. Frenkel defects $1$. $FeO$

$B$. Schottky defects $2$. $NaCl$

$C$. Vacancy defects $3$. $AgCl$

$D$. Metal deficiency defects $4$. Crystals with vacant lattice sites

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