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  4. According to Raoult's law, the relative lowering in vapour pressure of a solution is equal to

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Q. According to Raoult's law, the relative lowering in vapour pressure of a solution is equal to

Rajasthan PETRajasthan PET 2006

Solution:

According to Raoulfs law, the relative lowering of vapour pressure of solution is equal to mole fraction of solute.
$ \frac{p-{{p}_{s}}}{{{p}_{s}}}={{X}_{B}} $
where, $ p= $ Vapour pressure of pure solvent
$ {{P}_{s}}= $ Vapour pressure of solution $ {{X}_{B}}= $
Mole fraction of solute