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Question

Which defect causes decrease in the density of a crystal?

A
Frenkel
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B
Schottky
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C
Interstitial
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D
F-centre
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Solution

The correct option is B Schottky
Schottky defect causes decrease in the density of a crystal. In this defect, equal number of cations and anions are missing from their position in the crystal lattice.
Frenkel defect does not alter the density of a crystal. In this defect, cation or anion occupies an interstitial position.

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