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Account for the Silicon is an insulator ...

Account for the Silicon is an insulator but silicon doped with phosphorus acts as a semiconductor.

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The correct Answer is:
Silicon doped with phoshorus forms n-type of semiconductor. Phosphorus contains one extra electron than silicon which can move easily through the crystal and is responsible for semiconductor properties.
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  19. Account for the Silicon is an insulator but silicon doped with phospho...

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