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

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure ?1 Mark
MCQ
Naphthalene can be separated for sand:
  • A
    By sublimation.
  • B
    By distillation.
  • C
    By crystallisation.
  • D
    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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