Question

Assertion : Conductivity of silicon increases by doping it with group-15 elements.
Reason : Doping means introduction of small amount of impurities like P, As or Bi into the pure crystal.
A. P is non-metal whereas Al is a metal
B. P is a poor conductor while Al is a conductor
C. P gives rise to extra electrons while Al gives rise to holes
D. P gives rise to holes while Al gives rise to extra electrons

Answer 1

Correct Answer - C
Doping of Si with P gives extra electrons while doping with Al gives rise to holes.