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

Application of activated carbon reduces the temporary hardness of water
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

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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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