Statement - I : Conductivity of silicon increases by doping it with group-15 elements
Statement - II : Doping means introduction of small amount of impurities like P, As or Bi into the pure crystal.

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Both statements I and II are correct

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

Statement-I is correct and statement-II is incorrect

answer is A.

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Detailed Solution

When a silicon crystal is doped with a group-15 element, 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.
The foreign atom uses four of its electrons in covalent bonding but the remaining fifth electron becomes delocalized and is thus free to contribute to electrical conduction.

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