Multiple choice

Fractional crystallisation is used to separate

  1. two solids

  2. two liquids

  3. two gases

  4. a solid and a liquid

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A Correct answer
Explanation

In chemistry, fractional crystallisation is the method of refining substances based on differences in solubility. If a mixture of two or more substances in solution is allowed to crystallise, e.g. by allowing the temperature of the solution to decrease, the precipitate will contain more of the least soluble substance.