Ncert Exercises & Solutions

AgBr(s) crystals shows the following defect/s

I. Schottky defect

II. Frenkel defect

III. Metal excess defect

IV Metal deficiency defect

1. I and II

2. III and IV

3. I and III

4. II and IV

(1) HINT: AgBr shows both Schottky and Frenkel defects.

Explanation:

AgBr shows both Schottky as well as Frenkel defect. In AgBr, both Ag⁺ and Br^- ions are absent from the lattice causing Schottky defect. However, Ag⁺ ions are mobile so they have a tendency to move aside the lattice and trapped in interstitial site hence, cause Frenkel defect.

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