The apperance of colour in solid alkali metal halides is generally due to

Interstitial positions

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F- center

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Schottky defect

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Frenkel defect

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Solution

The correct option is B
F- center

F- centres $\Rightarrow$ sites where anions are missing and instead electrons are present

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Similar questions

Cations are present in the interstitial sites in ...........

(a) Frenkel defect (b) Schottky defect

Which of the following defects decrase the density ?

(a) Interstitial defect (b) Vacancy defect

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