Which of the following statements is NOT correct:

The correct answer is Option (2) → Majority carriers in an n-type semiconductor are holes.

The type of an extrinsic semiconductor depends on the dopant: a pentavalent donor adds free electrons (n-type) and a trivalent acceptor adds holes (p-type). Each statement is judged below.

Option (1) Pure silicon doped with a trivalent impurity gives a p-type semiconductor — Correct. A trivalent atom leaves a vacancy (hole) in a bond, so holes become the majority carriers.

Option (2) Majority carriers in an n-type semiconductor are holes — Not correct. In an n-type semiconductor the donor atoms supply extra electrons, so electrons are the majority carriers and holes are the minority carriers.

Option (3) Minority carriers in a p-type semiconductor are electrons — Correct. Holes are the majority carriers, and the thermally generated electrons are the minority carriers.

Option (4) The resistivity of an intrinsic semiconductor decreases with increase of temperature — Correct. More electron-hole pairs are generated at higher temperature, so the conductivity rises and the resistivity falls.

NCERT (2026-27):
Extrinsic Semiconductor – “… Hence in an extrinsic semiconductor doped with pentavalent impurity, electrons become the majority carriers and holes the minority carriers. These semiconductors are, therefore, known as n-type semiconductors.”