Q.

Consider the following statements.I. When Si is doped with P or As, four electrons of both Si and P or As are involved in covalent bond formation"II The fifth electron of Si is delocalised.III. Delocalisation increases the conductivity of doped Si.Which of these statement(s) is/are correct?

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a

I and III

b

II and III

c

I and II

d

I, II and III

answer is A.

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Detailed Solution

When Si is doped with P or As, four electrons of both Si and P or As are involved in covalent bond formation. The fifth electron of P or As is extra and becomes delocalized.Delocalization increases the conductivity of doped si.
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Consider the following statements.I. When Si is doped with P or As, four electrons of both Si and P or As are involved in covalent bond formation"II The fifth electron of Si is delocalised.III. Delocalisation increases the conductivity of doped Si.Which of these statement(s) is/are correct?