Presence of carbonaceous matter in the sewage
A. Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
B. Reduces sulphate ions to sulphides causing obnoxious smell
C. Increases the quantity of chlorine used for its purification
D. All of the above
Answer: Option D
This Question Belongs to Chemical Engineering >> Chemical Process
A mixture of chlorine & sodium bromide acts as a/an
A. Insecticides
B. Analgesic drug
C. Fire retardant
D. Hydrogenation catalyst
__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.
A. Phosphates
B. Chromates
C. Sulphates
D. Bi-carbonates
Hydrazine (N2H4) is used mainly as a/an
A. Explosive
B. Rocket fuel
C. Detergents additive
D. None of these
Common salt is generally not produced commonly by __________ method from brine.
A. Freeze drying
B. Electrolytic
C. Solar evaporation
D. Vacuum evaporation
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