Q198
Pick up the correct statement from the following:
A.
Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
B.
4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
C.
Solubility of oxygen in sewage is 95% of that of distilled water
D.
All the above
AnswerAnswer: Option D
Solution
Answer: Option D
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