Chemical Process
Hard water

Pollutes the water stream
Is not unfit for drinking purpose
All of these
Does not affect the lather formation by soap

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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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