Chemical Process
DDT stands for

Diethyl-diphenyl-trichloromethane
Diphenyl-dichloro-trichloromethane
Dichloro-diphenyl-trichloromethane
Dichloro-diphenyl-trichloroethane

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Chemical Process
Pick out the false statement pertaining to water treatment.

Water with pH value less than 7, is acidic
The zeolite water softening process reduces the hardness of water by not more than 50%
Aeration of water is effective in CO₂ removal
Sodium sulphate or sodium carbonate do not cause hardness in water

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