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(C) When silicon $(Si)$ is doped with an impurity having a valency less than $4$,a $p$-type semiconductor is obtained.Silicon belongs to group $14$ an

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$In$

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(C) When silicon $(Si)$ is doped with an impurity having a valency less than $4$,a $p$-type semiconductor is obtained.Silicon belongs to group $14$ and has a valency of $4$.Elements like $As$ (Arsenic),$P$ (Phosphorus),and $Sb$ (Antimony) belong to group $15$ and have a valency of $5$,which results in $n$-type semiconductors.$In$ (Indium) belongs to group $13$ and has a valency of $3$.Therefore,doping $Si$ with $In$ creates electron holes,resulting in a $p$-type semiconductor.

Which one of the following elements,when present as an impurity in silicon,makes it a $p$-type semiconductor?

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