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The Solid State
Question
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what is Frenkel defect.Why is Frenkel defect found in AgCl ?

Answer

Frenkel Defect: This defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site . It creates a vacancy defect at its original site and an interstitial defect at its new location.
 Frenkel defect is shown by ionic substance in which there is a large difference in the size of ions so it is due to difference in size of Ag+ and CI–, Ag+ occupies voids.

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