Chemical Process
Hydrazine is largely used

As a starting material for 'hypo'
As rocket fuel
In photographic industry
In printing industry

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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
A batch process for directly producing high strength (98 to 100%) H₂SO₄
Non-catalytic and operates only on pyrites

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