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

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

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

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

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