Question

Which of the following mixtures are separated using crystallisation?

• A. Oil and water
• B. sand and iron fillings
• C. Sugar and water
• D. Sand and water

Answer 1

The correct option is C Sugar and water

Crystallisation is the process of separating a soluble solid from the solution by heating or evaporating the solvent. This process is used when the solute is soluble in the solvent. Since oil and sand are insoluble in water, crystallisation cannot be used to separate them from water. Urea and sugar are soluble in water, therefore crystallisation can be used to separate urea and sugar from water.