Question

Among the following the incorrect statement is

• A. Density of crystals remains unaffected due to Frenkel defect.
• B. In BCC unit cell the void space is 32%.
• C. Density of crystals decreases due to Schottky defect.
• D. Electrical conductivity of semiconductors and metals increases with increase in temperature.

Hint:

The Frenkel defect does not change the overall density of the crystal, while the Schottky defect causes a reduction in density.

Answer 1

The Correct Option is A

Step 1: Understanding the Defects.
The Frenkel defect involves the displacement of an ion from its normal position to an interstitial position, which does not change the overall density of the crystal. However, the electrical conductivity can still be affected. The statement in (A) is incorrect because the Frenkel defect does not necessarily leave the density unaffected.
Step 2: Conclusion.
The correct answer is (A), Density of crystals remains unaffected due to Frenkel defect.