Chemical Process
The main use of HCl is in the

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

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Chemical Process
Use of hydrated lime in water treatment

Is to adjust the pH value
Before filtration, reduces the bacterial load on filters
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
All of these

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