Chemical Process
Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.

Phthalic anhydride
Maleic anhydride
Vinyl chloride
Dacron

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Chemical Process
The chamber process is

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

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