1.

Which of the following statements are not true?

Answer»

VACANCY defect results in a decrease in the density of the substance. 
Interstitial defects results in an INCREASE in the density of the substance. 
Impurity defect has no effect on the density of the substance. 
Frenkel defect results in an increase in the density of the substance. 

Solution :Impurity defects creats a HOLE at a site of cation and hence density of the lattice changes.
Ex. : Addition of `SrCl_2` to `NACL` crystal.
Frenkel defect cause no change in the density


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