Sn, C, Si and Ge are all group XIV eleme...

Sn, C, Si and Ge are all group XIV elements . Yet , Sn is a conductor , C is an insulator while Si and Ge are semiconductors . Why?

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The correct Answer is:

It all depends on energy gap between valence band conduction band. The
energy gap for Sn is 0 e V , for C is 5.4 eV , for Si is 1.1 eV and for Ge is 0.7 eV.

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Assertion (A) : C,Si and Ge have 4 Valancy each both but C is an insulator where as Si and Ge are semi conductors Reason ( R) : Energy gap is least for Ge , less for Si compared to C , So that free electrons for conduction in Ge and Si are significant but negligible small for C .

`A,R` are true and `R` explains `A` correctly

`A,R` are true and `R` do not explain `A` correctly

`A` is true, but `R` is false

`R` is true, but `A` is false

Three elements B, Si and Ge are

metals.

non-metals.

metalloids.

metal, non-metal and metalloid respectively.

Three elements B, Si and Ge are

metals

non-metals

metalloids

metal, non-metal and metalloid respectively

Sn, C, Si and Ge are all group XIV elements . Yet , Sn is a conductor , C is an insulator while Si and Ge are semiconductors . Why?

Text Solution

Topper's Solved these Questions

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Assertion (A) : C,Si and Ge have 4 Valancy each both but C is an insulator where as Si and Ge are semi conductors Reason ( R) : Energy gap is least for Ge , less for Si compared to C , So that free electrons for conduction in Ge and Si are significant but negligible small for C .

Three elements B, Si and Ge are

Three elements B, Si and Ge are

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