Chemical Process
During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to

Reduce the cooling water circulation rate
Increase the rate of absorption
Avoid corrosion
None of these

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

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

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Chemical Process
Transparent soaps (e.g. Pears) are

Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
None of these
Metallic soaps with frothing agent and free stearic acid to achieve transparency
Metallic soaps with frothing agent from which glycerine has not been recovered

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