Chemical Process
The chamber process is

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

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Chemical Process
Presence of carbonaceous matter in the sewage

Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Reduces sulphate ions to sulphides causing obnoxious smell
Increases the quantity of chlorine used for its purification
All of these

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