Waste Water Engineering - Engineering
Q1: If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly containsA
Hydrogen sulphide
B
Carbon dioxide
C
Methane
D
Oxygen
E
None of these.
ANS:A - Hydrogen sulphide If a paper moistened with lead acetate turns black when placed in a manhole, it indicates the presence of hydrogen sulfide gas (H2S). Lead acetate paper is commonly used as a detector for hydrogen sulfide because hydrogen sulfide reacts with lead acetate to form lead sulfide, which is black in color. So, the correct answer is: Hydrogen sulfide. |
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