AIIMS2010Chemistry-Uses of Group 15 Elements
AIIMS 2010 Chemistry Doping Assertion Reason Question
Type: Assertion Reason-conceptual-Medium-Class 12
Assertion: Conductivity of silicon increases by doping it with grou elements. Reason: Doping means introduction of small amount of impurities like P, As or Bi into the pure crystal.
A
If both assertion and reason are true and reason is the correct explanation of assertion.
B
If both assertion and reason are true but reason is not the correct explanation of assertion.
C
If assertion is true but reason is false.
D
If both assertion and reason are false.
Correct Answer
Option B
Detailed Explanation
When a silicon crystal is doped with a group-15 elements, such as P, As, Sb or Bi the structure of the crystal lattice is left unchanged but an occasional atom with five valence electrons occupies a site that would normally be occupied by a silicon atom.
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