What is mother liquor?

The hot saturated solution of the substance.

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Cooled down supersaturated solution.

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Excess solute in the solution.

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The saturated solution left behind after the separation of crystals.

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Solution

The correct option is D
The saturated solution left behind after the separation of crystals.

During crystallization, the hot saturated solution of the substance is allowed to cool slowly, it becomes supersaturated and at the moment of supersaturation, the excess solute in the solution is separated as crystals. After the separation of crystals, the saturated solution left behind is called mother liquor.

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