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Choose the only false statement from the following

1. In conductors, the valence and conduction bands may overlap
2. Substances with energy gap of the order of 10 eV are insulators
3. The resistivity of a semiconductor increases with increase in temperature
4. The conductivity of a semiconductor increases with increase in temperature

Correct answer: The resistivity of a semiconductor increases with increase in temperature

Solution

In semiconductors, resistivity decreases with an increase in temperature because more charge carriers are thermally excited to the conduction band, increasing conductivity.

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