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Is Matter Around Us Pure? — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?1 Mark
Question
Naphthalene can be separated for sand:
  1. By sublimation.
  2. By distillation.
  3. By crystallisation.
  4. By using water as solvent.
✓

Answer

  1. By sublimation.

Explanation:

Naphthalene sublimes on heating, whereas sand does not. So, when the mixture is heated, solid naphthalene turns into vapours, which can be condensed. Sand remains in the container.

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