Assertion : Frenkel defect is also called dislocation defect.
Reason : Frenkel defect is shown by ionic substances in which cation and anion are of almost similar sizes.

Options

A. If both (A) and ( R) are correct and ( R) is the correct explanation of(A).
B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).
C. If (A) is correct, but ( R) is incorrect.
D. If both (A) and ( R) are incorrect.

Answer

C

Explanation

Frenkel defect is called dislocation defect because smaller ion (generally the cation) is dislocated from its normal site to an interstitial site. It is shown by ionic substances in which there is large difference in the size of ions e.g. ZnS, AgCl.