Which of the following defects does KBr show?

Which of the following elements does not show allotropy?

Which of the following elements does not show disproportionation tendency?

Which of the following point defect are show by AgBr(s) crystals? i) Schottky defect ii) Frenkel defect iii) Metal excess defect iv) Metal deficiency defect

Which of the following defects is also known as a dislocation defect?