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

1. Schottky defect
2. Frenkel defect
3. Stoichiometric defect
4. F-centres

Correct answer: F-centres

Solution

When electrons are trapped in anion vacancies, they create F-centres, which impart color to the crystal. This is a specific type of defect in the crystal lattice.

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