Brine is an aqueous solution of
NaCl
NaOH
NaHCO₃
Na₂CO₃
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This question was previously asked in
UPSC NDA-1 – 2018
Brine is an aqueous solution of sodium chloride (NaCl), commonly known as table salt. It is a solution of salt dissolved in water, typically with a high concentration of NaCl. Seawater is a naturally occurring brine, although brine can also be produced by dissolving rock salt deposits in water.