Question

Which of the following statement is incorrect regarding band theory?

• A. For conductors, no energy gap is there between conduction band and valence band
• B. For semiconductors, small energy gap is there between conduction band and valence band
• C. For insulators, large energy gap is there between conduction band and valence band
• D. None of these

Answer 1

The correct option is D None of these

Conductors are mostly metals, they do not have any energy gap between conduction band and valence band since they overlap.
Semiconductors have small energy gap between the conduction and valence band and hence, the electron can jump to conduction band but not so easily as in conductors.
In insulators, the energy gap between valence band and conduction band is large and hence, electron cannot jump from valence band to conduction band