The method of separating a mixture of soluble solids by dissolving them in a suitable hot solvent and then lowering the temperature slowly is called:

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SSC CHSL Exam 2024 Tier-I Official Paper (Held On: 01 Jul, 2024 Shift 3)
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  1. sublimation
  2. fractional crystallisation
  3. azeotropic distillation
  4. dephlegmation

Answer (Detailed Solution Below)

Option 2 : fractional crystallisation
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The correct answer is fractional crystallisation

Key Points

  • Fractional crystallisation is a method of separating a mixture of soluble solids.
  • This process involves dissolving the mixture in a suitable hot solvent.
  • The temperature is then slowly lowered, which causes the different components to crystallise at different temperatures.
  • This method is used to purify substances and separate components based on their solubility.

Additional Information

  • Sublimation is a process where a solid changes directly into a gas without going through a liquid phase.
  • Azeotropic distillation is used to separate components of a mixture by distillation, involving an azeotrope.
  • Dephlegmation is a process used in the distillation of mixtures to separate components with close boiling points.
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