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# The mole fraction of the solute in one molar aqueous solution is

$(a)\;0.009\qquad(b)\;0.018\qquad(c)\;0.027\qquad(d)\;0.036$

Mole fraction of solute =$\large\frac{1}{1+\Large\frac{1000}{18}}$
$\Rightarrow 0.018$
Hence (b) is the correct option.