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If a small amount of antimony is added to germanium crystal:

1. it becomes a p–type semiconductor
2. the antimony becomes an acceptor atom
3. there will be more free electrons than holes in the semiconductor
4. its resistance is increased

Correct answer: there will be more free electrons than holes in the semiconductor

Solution

Adding antimony (a pentavalent impurity) to germanium introduces extra electrons, making it an n-type semiconductor with more free electrons than holes.

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