Question

Assertion: In a metal all the free electrons have same energy. 

Reason : Electrons do not obey Pauli's exclusion principle.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (c).

Explanation:

Assertion is correct in the sense that the free electrons occupy a single energy band. But a band has a distribution of energy. One can treat assertion as correct. But the reason is,false because electrons in a metal follow Pauli's exclusion principle. It is because of this, one has different bands. Therefore the answer is (c).