MHT CET Physics question

Not in JEE Advanced syllabus

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

Answer: (C)

Solution

In carbon the bonding electrons are in the second shell, tightly bound, giving a large band gap, while in Si they are in

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Question ID VK-085433