Chemical Process
Good quality of edible salt is obtained from brine by the process of

Solar evaporation
Vacuum evaporation
Freeze drying
Electrolysis

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Chemical Process
Presence of sodium tripolyphosphate (an additive) in synthetic detergent

Inhibits its corrosive effects
None of these
Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)
Does not allow redeposition of dirt on the cleaned surface

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