Question

Frenkel defect is generally observed in

• A. AgBr
• B. AgI
• C. ZnS
• D. All of the above

Hint:

Frenkel defect occurs in solids with small cations and large anions, like AgCl, AgBr, AgI, ZnS.

Answer 1

The Correct Option is D

Step 1: Definition of Frenkel defect.
Frenkel defect occurs when an ion (usually cation) leaves its lattice site and occupies an interstitial site.
This creates:
- a vacancy defect
- an interstitial defect
Step 2: Conditions for Frenkel defect.
It is common in ionic solids where:
- cation is small
- anion is large
So small cation can move into interstitial positions.
Step 3: Examples.
AgBr, AgI and ZnS show Frenkel defect because their cations are relatively small.
Final Answer: \[ \boxed{\text{All of the above}} \]