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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Chemical Process
Oil is a/an

Mixture of glycerides of fatty acids
Ester of alcohols other than glycerine
Solid at normal temperature
Mixture of glycerides

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