CBSE Class 12 Physics 2023 Delhi Set 2 Paper

Question : 5

Total: 11

Assertion (A): In insulators, the forbidden gap is very large.
Reason (R): The valence electrons in an atom of an insulator are very tightly bound to the nucleus.

Both Assertion (A) and Reason (R) are true and (R) is the correct explanation of (A).
Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
Assertion (A) is true and Reason (R) is false.
Assertion (A) is false and Reason (R) is also false.

Solution: 👈: Video Solution

In insulators forbidden band gap is more than 3eV which is large enough. So, the assertion is true.
Since, the electrons are very tightly bound to nucleus they cannot easily jump to the conduction band. This explains why the forbidden band gap is so large.
So, the reason is also true and it explains the assertion.

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