When common salt is added to a saturated solution of soap, soap is precipitated. This is based on the principle of

Common ion effect

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Principle of solubility product

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Adsorption from solution

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Peptisation

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Solution

The correct option is B Common ion effect
When common salt is added to a saturated solution of soap, it lowers the solubility of soap in the solution and helps in precipitation. So, it becomes easy to separate soap from the remaining solution. This principle is called common ion effect.

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