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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