Chemical Process
The main use of HCl is in the

Drilling of petroleum wells and pickling of steel sheets
None of these
Treatment of spent fuel of nuclear reactor
Manufacture of cationic detergent

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Chemical Process
Viscose rayon

Cannot yield textile grade fibre
Cannot be made from sulphite pulp
None of these
Utilises H₂SO₄, NaOH and CS₂ during its manufacture

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