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Q.

Which defect causes decrease in the density of the crystal ?

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a

Frenkel

b

Interstitial

c

Schottky

d

F-centre

answer is C.

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Detailed Solution

Schottky defect is one of the two types of intrinsic thermodynamic defects observed in ionic solids.

In this type of defect, pairs of cations and anions are missing such that the crystal remains electrically neutral. Since mass of the crystal is decreased, density also decreases.

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