Chemical Process
BHC (Benzene hexachloride) is made by the chlorination of benzene

Which is an addition reaction
In presence of sunlight
In absolute dark
Which is a substitution reaction

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Chemical Process
Liquefaction of gases can not be done by

Merely compressing it beyond critical pressure
Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Adiabatic expansion against a piston or in a turbine

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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
Application of activated carbon reduces the temporary hardness of water
Activated carbon can be used for taste & odour control without subsequent filtration
Slow sand filters can remove colour completely

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