Which one of the following defects in the crystals lowers its density?

Frenkel defect

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Schottky defect

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F-centres

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Interstitial defect

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Solution

The correct option is C Schottky defect
Schottky defect lowers its density. This defect is due to vacancies caused by absence of pair of anions and cations in crystal. In Frenkel defect, F-centres and Interstitial defect, the density remains unchanged.
Option B is correct.

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