Chemical Process
__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.

Chlorine
Sodium carbonate
Sodium bi-carbonate
Ammonium chloride

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

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

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