A) the lowering of vapour pressure is equal to the mole fraction of the solute
B) the relative lowering of vapour pressure is equal to the mole fraction of solute
C) the relative lowering of vapour pressure is equal to the amount of the solution
D) the vapour pressure of the solution is equal to the mole fraction of the solvent
Correct Answer: B
Solution :
According to Raoults law, \[\frac{{{p}^{o}}-p}{p}={{\chi }_{A}}\] where,\[\frac{{{p}^{o}}-p}{p}=\]relative lowering of vapour pressure \[{{\chi }_{A}}=\]mole fraction of solute
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