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(C) According to Raoult's law for a solution containing a non-volatile solute,the relative lowering of vapour pressure is given by: $\frac{P^\circ - P

Vedclass · Accepted Answer

$\frac{P^\circ - P_s}{P_s} = \frac{n}{n + N}$

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(C) According to Raoult's law for a solution containing a non-volatile solute,the relative lowering of vapour pressure is given by: $\frac{P^\circ - P_s}{P^\circ} = \frac{n}{n + N}$.From this,we can derive other forms:$1$. $\frac{P_s}{P^\circ} = 1 - \frac{n}{n + N} = \frac{N}{n + N}$ (Correct,Option $A$)$2$. $\frac{P^\circ - P_s}{P_s} = \frac{n}{N}$ (Correct,Option $C$ is $\frac{n}{n+N}$,which is incorrect as it should be $\frac{n}{N}$)$3$. $\frac{P^\circ}{P^\circ - P_s} = \frac{n + N}{n} = 1 + \frac{N}{n}$ (Correct,Option $B$)$4$. $\frac{P_s}{P^\circ - P_s} = \frac{N}{n}$ (Correct,Option $D$)Option $C$ is the incorrect form because the denominator on the left side should be $P_s$ and the right side should be $\frac{n}{N}$ for the ratio to be correct,or the expression $\frac{P^\circ - P_s}{P_s} = \frac{n}{n+N}$ is mathematically inconsistent with the standard definition.

Which of the following is an incorrect form of Raoult's law?

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