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# For a dilute solution,Raoult's law states that

$\begin{array}{1 1}\text{the lowering of vapour pressure is equal to the mole fraction of solute}\\\text{the relative lowering of vapour pressure is equal to the mole fraction of solute}\\\text{the relative lowering of vapour pressure is proportional to the amount of solute in the solution}\\\text{the vapour pressure of the solution is equal to the mole fraction of solvent}\end{array}$

Answer : the relative lowering of vapour pressure is equal to the mole fraction of solute
Relative lowering of vapour pressure,
$-\Delta p/p^*=-(p-p^*)/p^*=1-x_1=x_2$