A) \[\frac{1}{7.6}\]
B) \[\frac{1}{76}\]
C) \[\frac{1}{46}\]
D) \[\frac{1}{38}\]
Correct Answer: B
Solution :
[b]Vapour pressure \[(p_{A}^{o})\] of pure water at equilibrium |
\[={{p}_{atm}}\] |
\[=760\] mm Hg |
Vapour pressure of aq. Solution of glucose |
\[=750\] mm Hg |
Relative lowering of vapour pressure is |
\[\frac{p_{A}^{o}-p}{p_{A}^{o}}={{\chi }_{B}}\] |
where, \[{{\chi }_{B}}=\] mole fraction of glucose |
\[{{\chi }_{B}}=\frac{760-750}{760}=\frac{1}{76}\] |
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