SELECT * FROM question_mgmt as q WHERE id=2751 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=8 AND chapterId=128 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (E g ) C , (E g ) Si and (E g ) Ge . Which of the following statements is true?

(a) (E g ) Si < (E g ) Ge < (E g ) C

(b) (E g ) C < (E g ) Ge > (E g ) Si

(c) (E g ) C > (E g ) Si > (E g ) Ge

(d) (E g ) C = (E g ) Si = (E g ) Ge

Answer:

The energy band gap is maximum for carbon, less for silicon and least for germanium out of the given three elements.

Hence answer is (c) is correct.


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