Sodium chloride is used in soap industry for soap's __________ .

decomposition

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removal of hardness

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precipitation

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None of the above

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Solution

The correct option is B precipitation
The addition of salt (sodium chloride) to the crude form of soap forms fatty-acid salts. The sodium ions from the sodium chloride bond with the fatty acid, forming a product that is less soluble in water. Because of this reduced solubility, the soap leaves the solution and forms a solid mass. This process of "dropping" out of the solution is called precipitation.
Therefore option C is correct.

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