Multiple choice

In the secondary treatment of sewage, during digestion, bacteria produce a mixture of gases. Which of the following gases is/are not produced?

(a) methane (b) hydrogen sulphide (c) nitrous oxide (d) carbon dioxide (e) oxygen

  1. Only a and b

  2. Only c

  3. Only c and e

  4. Only b and d

  5. Only d and e
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is the correct answer. In the secondary treatment of sewage, during digestion, bacteria produce a mixture of gases. But from the above given gases, nitrous oxide and oxygen are not produced.

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