Q: When a pair of one cation and one anion are absent from an ionic crystal, then the defect is called
(a)Schottky's defect
(b)Frenkel's defect
(c)Cross-slip defect
(d)Stacking defect
Correct Answer: (a)
The correct answer is (b) 'Frenkel's defect'. This question from the Geology & Geophysics domain tests knowledge of General Geology.