Which of the following, when added as an impurity, into

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Which of the following, when added as an impurity, into the silicon, silicon, produces n-type semi-conductor?

1. Phosphorous
2. Aluminium
3. Magnesium
4. Both b and c

Correct Option: A

Phosphorous (P) is pentavalent and silicon is tetravalent. Therefore, when silicon is doped with pentavalent impurity, it forms a n-type semiconductor.