a. Metal excess defect
b. Metal deficiency defect
c. Displacement defect
d. Impurity defect
Ans. b
Explanation : Metal deficiency occurs when metals show variable valency
a. Metal excess defect
b. Metal deficiency defect
c. Displacement defect
d. Impurity defect
Ans. b
Explanation : Metal deficiency occurs when metals show variable valency
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