Chemical Process
The chamber process is

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
Non-catalytic and operates only on pyrites

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Chemical Process
Use of hydrated lime in water treatment

All of these
Before filtration, reduces the bacterial load on filters
Is to adjust the pH value
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂

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