When a pair of cation and anion is absent from crystal, it is called:

1.	When a pair of cation and anion is absent from crystal, it is called:
A.	Vacancy defect
B.	Line Imperfection
C.	Schottky‚Äö√Ñ√∂‚àö√ë‚àö¬•s defect
D.	Frenkel defect
Answer» D. Frenkel defect

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