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Metal Excess Defect

The apperance...

Question

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

A

Interstitial positions

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B

F- center

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C

Schottky defect

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D

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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Q. Assertion: Anion vacancies in alkali halides are produced by heating the alkali halide crystals with alkali metal vapour.
Reason: Electrons trapped in anion vacancies are referred to as F-centers.

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Metal Excess Defect

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