Chemical Process
Oxidation of SO₂ to SO₃ is favoured by

Low temperature and high pressure
High temperature and low pressure
Low temperature and low pressure
High temperature and high pressure

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Chemical Process
The chamber process is

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

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