(i) stoichiometric defect

(ii) dislocation defect

(iii) impurity defect

(iv) non-stoichiometric defect

Correct Answers:

(i) stoichiometric defect

(ii) dislocation defect

Explanation:  The dislocation of cations occurs with no change in the stoichiometry of the crystal. So, Frenkel defect is also known as stoichiometric defect or dislocation defect.