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Matter in Our Surroundings — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings1 Mark
MCQ
Choose the correct statement of the following:
  • A
    Conversion of solid into vapours without passing through the liquid state is called vapourisation.
  • ✓
    Conversion of vapours into solid without passing through the liquid state is called sublimation.
  • C
    Conversion of vapours into solid without passing through the liquid state is called freezing.
  • D
    Conversion of solid into liquid is called sublimation.
✓

Answer

Correct option: B.
Conversion of vapours into solid without passing through the liquid state is called sublimation.
Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process. The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.

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