Which theory is useful in explaining electrical conductivity in conductors and semiconductor?

Pauli's principle

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Avogadro's theory

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Band theory

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Hybridistion theory

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Solution

The correct option is C Band theory
Band theory;
Band theory is useful in explaining electrical conductivity in conductors and semiconductors.
Band theory $\to$ Because of the very large number of atoms that interacts in a solid material the energy levels are so closely spaced that they form bands. Energy separation between these bands is called band gap.

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