Pure sodium chloride is obtained by :

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solar evaporation of sea water

Castner-Kellner's process

crude salt is dissolved in minimum amount of water and filtered to remove insoluble impurities. Solution is then saturated with $HCl$ gas

Solvay's process

answer is B.

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Detailed Solution

Pure sodium chloride is obtained by crude salt is dissolved in minimum amount of water and filtered to remove insoluble impurities. The solution is then saturated with $HCl$ gas.

Pure sodium chlorides are made by dissolving crude sodium chloride because they are quick to absorb moisture from the air. <br> By combining crude sodium chloride with the least quantity of water possible and filtering the solution to eliminate insoluble contaminants, pure sodium chlorides can be produced. <br> $HCl$ gas has been absorbed completely by this solution.

Hence, option B is correct.

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