Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

None of these
Sulphuric acid and napthamine
Phenol-di -sulphuric acid potassium hydroxide
Potassium permanganate

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Waste Water Engineering
In case of sewer lines

Test for straightness is carried out with the help of a lamp and mirror
All listed here
Water test is carried out to check water tightness of the joints
Obstruction test is carried out with the help of smooth ball of diameter 13 mm

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