p-type semiconductor are

positively charged

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produced when boron is added as an impurity

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produced when phosphorus is added as an impurity to silicon

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produced when carbon is added as an impurity to germanium.

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Solution

The correct option is B produced when boron is added as an impurity
Boron has valency three. When boron is doped in a pure semiconductor, then p-type semiconductor is formed.

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