Physics-(general)
NEET Physics (general) Assertion Reason Question
Type: Assertion Reason-assertion-Medium-Class 12
Assertion (A): Doping silicon with a pentavalent element increases its number of free electrons. | Reason (R): Pentavalent dopants have one more valence electron than silicon, which becomes a free electron in the crystal lattice.
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 the correct explanation of A.
C
A is true but R is false.
D
A is false.
Correct Answer
Option A
Detailed Explanation
Doping silicon with a pentavalent element like phosphorus increases the number of free electrons because the extra valence electron from the dopant becomes a free electron, enhancing conductivity.
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