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    Chemistry
    Grade-6
    Easy

    Question

    Vapor pressure of liquid and atmospheric pressure should always be:

    1. V. P=A.P
    2. V.P>A.P
    3. V.P<A.P
    4. Remains constant

    Hint:

    V.P.=A.P. liquid boils.

    The correct answer is: V. P=A.P

      • At the normal boiling point of a liquid, the vapor pressure is equal to standard atmospheric pressure.
      • When the vapor pressure is equal to atmospheric pressure the liquid molecules escape the surface, and the liquid boils.
      • If the vapor pressure is greater than the atmospheric pressure the liquid will boil at a higher temperature.
      • If the vapor pressure is less than the atmospheric pressure the liquid will boil at a lower temperature.

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