Question

Liquid A and B form soln deviating from roults law and the former has stronger intermolecular forces , if XA and YA are mole fractions of A in soln and vapour pressure in soln respectively, then
A) YA/ XA = 1
B) YA/ XA >1
C) YA/ XA < 1
D)YA+ XA = 1
Answer with reason

Answer 1

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HERE IS UR ANSWER

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Answer is YA + XA = 1

Reason

X and Y are equal

A is constant So,Answer is 1

Answer 2

Answer:

The ratio of $Y_{A}$ and $X_{A}$ will be less than one.

Explanation:

Given that $Y_{A}$ is the mole fraction of a in vapor phase  and  $X_{A}$ is the mole fraction in solution.

We know

                 $Y_{A}=\frac{p^{o}_{A}X_{A}}{P}\\ \\ \frac{Y_{A}}{X_{A} }=\frac{p^{o}_{A}}{P}$            

where P is the vapor pressure of solution   $p^{o}_{A}$ is the vapor pressure of pure liquid A.  Since the liquid A is less volatile than solution.  

  ∴     $p^{o}_{A} < P$

So    $\frac{Y_{A}}{X_{A} }=\frac{p^{o}_{A}}{P} < 1$

Therefore   $\frac{Y_{A}}{X_{A} }= < 1$

Hence the option C is correct.