What do you understand by lowering of vapourpressure?
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Relative lowering of vapor pressure. The vapor pressure of a liquid is thepressure of the vapor which is in equilibrium with that liquid. The vaporpressure of a solvent is lowered when a non-volatile solute is dissolved in it to form a solution
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Vapor Pressure Lowering - Vapor pressure lowering is a colligative property of solutions. The vapor pressure of a pure solvent is greater than the vapor pressure of a solution containing a non volatile liquid. This lowered vapor pressure leads to boiling point elevation.
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