Assertion: Sodium chloride is added to precipitate soap after saponification. Reason: Hydrolysis of esters of long-chain fatty acids by alkali produces soap in colloidal form.

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Assertion and reason both are correct and reason explains the assertion. Explanation: Hydrolysis of esters of long-chain fatty acids by alkali gives soap a colloid. The process is called saponification. Sodium chloride is added to precipitate soap which is in colloidal form.

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