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
Application of activated carbon reduces the temporary hardness of water
Normally, the turbidity is removed by adding a coagulent prior to sedimentation

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Chemical Process
Vulcanisation of rubber

Increases its ozone & oxygen reactivity
Decreases its tensile strength
Converts its plasticity into elasticity
Increases its oil & solvent resistance

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