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Standard XII
Chemistry
Relative Lowering of Vapour Pressure
Question

Addition of non-volatile solute to water always lowers its vapour pressure.

  1. True
  2. False

A
False
B
True
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Solution
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When a solute is dissolved in a solvent, the number of solvent molecules near the surface decreases and the vapor pressure of the solvent decreases. The tendency of the water molecules to evaporate in the gas phase decreases. Thus the above statement is true.

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