Chemical Process
Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate

All of these
Has high water solubility and is unstable
Is prone to thermal decomposition
Is soluble in ammonium chloride and potassium chloride solution

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Chemical Process
The chamber process is

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

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