For a dilute solution, Raoult’s law states that :

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The relative lowering of vapour pressure is equal to the mole fraction of solute.

The vapour pressure of the solution is equal to the mole fraction of solvent.

The relative lowering of vapour pressure is equal to the mole fraction of solvent

The relative lowering of vapour pressure is proportional to the amount of solute in solution

answer is A.

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Detailed Solution

According to Raoult's law,

$\large \frac{P^o-P}{P^o}=\frac{n_s}{n_s+n_o}=\chi _s$

RLVP = M.F of solute

where , P^o = VP of pure solvent , P= VP of sol.

n_s = no.of moles of solute, n_o = no.of moles of solvent

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