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a
metal excess defect because of excess of cation
b
metal excess defect because of absence of anion
c
Frenkel defect
d
Schottky defect
answer is A.
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Detailed Solution
It is clear from the figure that there is an excess of cation and electrical neutrality is made by the interstitial electron. This is thus metal excess defect and lattice may be represented as A1+δ.