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C, Si and Ge have same lattice structure...

C, Si and Ge have same lattice structure. Why is C insulator,
while Si and Ge intrinsic semiconductors ?

Text Solution

Verified by Experts

The correct Answer is:
A
The energy gap between conduction band and valence band is least for Ge, followed
by Si and highest for C. Hence, number of free electrons are negligible for C. This is why carborn
is insulator.
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Knowledge Check

  • C and Si have

    A
    Same physical properties
    B
    Different physical properties
    C
    Same pyhsical but different chemical properties
    D
    Different chemical and physical properties

  • 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
    `A,R` are true and `R` explains `A` correctly
    B
    `A,R` are true and `R` do not explain `A` correctly
    C
    `A` is true, but `R` is false
    D
    `R` is true, but `A` is false

  • C and Si both have same lattice structure, having 4 bonding electrons in each. However, C is insulator whereas Si is intrinsic semiconductor. This is because

    A
    The four bonding electrons in the case of C lie in the second orbit, whereas in the case of Si they lie in the third.
    B
    The four bonding electrons in the case of C lie in the third orbit, whereas for Si they lie in the fourth orbit.
    C
    In case of C the valence band is not completely filled at absolute zero temperature.
    D
    In case of C the conduction bans is partly filled even at absolute zero temperature.

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    The lattice structure for both carbon and silicon is same with each of them having 4 bonding electrons c is an insulator wheres Si is semiconductor why

    C and Si both have same lattice structure, having 4 bonding electrons in each. However, C is insulator whereas Si is intrinsic semiconductor. This is because

    C and Si both have same lattice structure, having 4 bonding electrons in each. However, C is insulator whereas Si is intrinsic semiconductor. This is because

    Three elements B, Si and Ge are

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