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In an insulator, the forbidden energy ga...

In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of

A

Both the bands are overlapped with each other

B

Very small

C

Infinite

D

Very large

Text Solution

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The correct Answer is:
D
When insulators (non metal atoms) interact to form a solid, their atomic orbitals mix to form two bunches of orbitals, separated by a large band gap. Electrons cannot therefore be promoted to an empty level, where they could move freely.
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