Chemical Process
Dichloro diphenyl __________ is the full form of DDT (an insecticide).

Trichloromethane
Tetrachloroethane
Tetrachloromethane
Trichloroethane

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

Slow sand filters can remove colour completely
Normally, the turbidity is removed by adding a coagulent prior to sedimentation
Application of activated carbon reduces the temporary hardness of water
Activated carbon can be used for taste & odour control without subsequent filtration

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