A) \[\frac{p-{{p}_{s}}}{p}=\frac{n}{n+N}\]
B) \[\frac{{{p}_{s}}-p}{p}=\frac{N}{N+n}\]
C) \[\frac{p-{{p}_{s}}}{{{p}_{s}}}=\frac{N}{N-n}\]
D) \[\frac{{{p}_{s}}-p}{{{p}_{s}}}=\frac{N-n}{N}\]
Correct Answer: A
Solution :
According to Raoults law, for non-volatile solute, the relative lowering of vapour pressure of a solution is equal to the mole fraction of the solute. \[\frac{p-{{p}_{s}}}{p}=\frac{n}{n+N}\]
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