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

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

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Chemical Process
Presence of carbonaceous matter in the sewage

Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Increases the quantity of chlorine used for its purification
All of these
Reduces sulphate ions to sulphides causing obnoxious smell

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