A) \[\frac{1}{20}\]
B) \[\frac{1}{38}\]
C) \[\frac{1}{76}\]
D) \[\frac{1}{740}\]
Correct Answer: B
Solution :
At STP (273 K) the vapour pressure of aqueous solution of glucose \[=760\text{ }mm\text{ }Hg\] At 373 K, the \[VP=740\text{ }mm\text{ }Hg\] We know that, Relative lowering of \[VP\propto mole\]fraction of solute \[\frac{{{p}^{o}}-p}{{{p}^{o}}}={{X}_{A}}\] \[\frac{760-740}{760}={{X}_{A}}\] \[\frac{20}{760}={{X}_{A}}\] \[\therefore \] \[{{X}_{A}}=\frac{2}{76}=\frac{1}{38}\]
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