Q.

Which of the following has Frenkel defect? 

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a

Graphite

b

Diamond

c

Silver bromide

d

Sodium chloride

answer is C.

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Detailed Solution

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  • Frenkel defect is a defect which is created when an ion leaves its appropriate site in the lattice and occupies an interstitial site. 
  • A hole or vacancy is thus produced in the lattice.
  • Frenkel defect is exhibited in ionic compounds in which the radius ratio is low. 
  • The cations and anions differ much in their sizes and the ions have low co-ordination numbers. Examples are ZnS, AgBr, AgI, AgCl.
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