When electrons are trapped into crystalline the anion vacancy, the defect is known as:

Schottky defect

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Stoichiometric defect

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Frenkel defect

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F-centres

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Solution

The correct option is D F-centres
$F - c e n t r e s$ are the sites where anions are missing and instead electrons are present. they are responsible for colour.

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Which of the following defects decrase the density ?

(a) Interstitial defect (b) Vacancy defect

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