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An intrinsic semiconductor is converted into n-type extrinsic semiconductor by doping it with

(1) Germanium

(2) Phosphorous

(3) Aluminium

(4) Silver
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Electronic devices,semiconductors

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Ans: (2) Phosphorous

Sol. When intrinsic semiconductor (Si or Ge) is doped with a pentavalent element, e.g. phosphorus (P), a n-type extrinsic semiconductor is created because pentavalent dopant donates one extra electron for conduction.

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