HomeTestsSearchRankProfile
mediumMCQAIEEE 20072026Physics
1 attempts0% success rate1 mark

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?

  1. A
    The number of free conduction electrons is significant in C but small in Si and Ge.
  2. B
    The number of free conduction electrons is negligibly small in all the three.
  3. C
    The number of free electrons for conduction is significant in all the three.
  4. D
    The number of free electrons for conduction is significant only in Si and Ge but small in C.

Solution & Step-by-step Explanation

Carbon (Diamond), Silicon, and Germanium all belong to the same group. However, their band gaps differ significantly:Carbon (Diamond) has a very large band gap , making it an insulator. The number of free electrons at room temperature is negligible.Silicon and Germanium have smaller band gaps, allowing some electrons to jump to the conduction band at room temperature.Therefore, Si and Ge have significant free electrons compared to C at room temperature.

Practice this question

Try it yourself before checking the explanation above.

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?
A
The number of free conduction electrons is significant in C but small in Si and Ge.
B
The number of free conduction electrons is negligibly small in all the three.
C
The number of free electrons for conduction is significant in all the three.
D
The number of free electrons for conduction is significant only in Si and Ge but small in C.

Share This Question

Semiconductors

Related Questions

easyMCQ

Which one of the following statements is true?

easyMCQ

Which of the following statements is not correct?

easyMCQ

Which one of the following statements is correct?

easyMCQ

The product formed by the reaction of an aldehyde with a primary amine is:

easyMCQ

Which part of the tobacco plant is infected by Meloidogyne incognita?

easyMCQ

The term ecosystem was coined by:

Ready for a Full Test?

Practice with timed mock tests and track your performance across Physics.

Browse TestsLeaderboard

Discussion