A) 0.75
B) 0.25
C) 0.48
D) 0.3
Correct Answer: B
Solution :
According to Raoult's law, Relative lowering of vapour pressure \[\propto \]mole fraction of solute or \[\frac{{{p}^{o}}-{{p}_{s}}}{{{p}^{{{o}_{B}}}}}={{\chi }_{B}}\] or \[\frac{0.80-0.60}{0.80}={{\chi }_{B}}\] \[\therefore \] \[{{\chi }_{B}}=\frac{1}{4}=0.25\]You need to login to perform this action.
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