When electrons are trapped into the crystal in anion vacancy, the defect is known as

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F-centre defect

Schottky defect

Stoichiometric defect

Frenkel defect

answer is D.

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Detailed Solution

Anions are absent from F-centers, which are where electrons are present. They are in charge of colour. Hence, the defect is known as an F-center defect.

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