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  4. The relative lowering of vapour pressure is equal to the mole fraction of the solute. This law is called

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Q. The relative lowering of vapour pressure is equal to the mole fraction of the solute. This law is called

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Solution:

According to Raoult’s law, for dilute solutions containing non volatile solute, the relative lowering of vapor pressure,
$\frac{\triangle P }{ P _{ o }}$ is equal to the mole fraction of solute, $X _{2}$.