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a
Vacancy defect results in a decrease in the density of the substance
b
Interstitial defects result in an increase in the density of the substance
c
Impurity defect has no effect on the density of the substance
d
Frenkel defect results in an increase in the density of the substance
answer is C.
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Detailed Solution
Impurity defect changes the density of substance as impurity has different density than the ion present in perfect crystal. Frenkel defect has no effect on density of the substance.