9th Class Science Is Matter Around Us Pure Question Bank 9th CBSE Science Is Matter Around Us Pure

  • question_answer
      Why is crystallisation technique considered better than simple evaporation to purify solids?

    Answer:

                   Crystallisation is considered better than simple evaporation because    (i) some solids decompose or get charred on heating to dryness.       (ii) some impurities may remain dissolved in the solution even after filtration. On evaporation, these contaminate the solid.         


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