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Matter in Our Surroundings — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings1 Mark
MCQ
What is latent heat of vaporization:
  • A
    Heat absorbed when a substance changes phase from solid to gas.
  • B
    Heat absorbed when a substance changes phase from liquid to gas.
  • C
    Heat released when a substance changes phase from liquid to gas.
  • D
    Heat absorbed when a substance changes phase from gas to liquid.
✓

Answer

  1.  Heat absorbed when a substance changes phase from liquid to gas.

Explanation: 

Latent heat of vaporization is the amount of heat absorbed when 1 kg of liquid changes into vapor at constant temperature.

When a liquid vaporize at the normal boiling point the temperature of the liquid will not rise beyond the temperature of the boiling point. 

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