1.

(A) Conductivity of silicon increases by doping it with group-15 elements. (R) Doping means introduction of small amount of impurities like P, As or Bi into the pure crystal.

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Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :B


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