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

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

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Chemical Process
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

Cause cholesterol build up and blood clotting
Always contain some amount of nickel (as their complete removal is very difficult)
Are prone to rancid oxidation
Have affinity to retain harmful sulphur compounds

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