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

Normally, the turbidity is removed by adding a coagulent prior to sedimentation
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

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Chemical Process
The chamber process is

Non-catalytic and operates only on pyrites
Preferred over contact process for producing 98 to 100% H₂SO₄ and various oleums
None of these
A batch process for directly producing high strength (98 to 100%) H₂SO₄

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