The vapour pressure of the solution of two liquids $A (p^{o} = 80 m m$ ) and $B (p^{o} = 120 m m)$ is found to be $100 m m$ when $x_{A} = 0.4$ . The result shows that:

solution exhibits ideal behaviour

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solution shows positive deviations

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solution shows negative deviations

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solution will show positive deviations for lower concentration and negative deviations for higher concentrations

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Solution

The correct option is C solution shows negative deviations
$\begin{matrix} P_{A}^{0} & = 80 m m P_{B}^{\circ} = 120 m m x_{n} = 0.4 x_{B} = 0.6 P_{T} & = x_{A} P_{A}^{0} + x_{B} P_{0}^{0} = 0.4 \times 80 + 0.6 \times 120 = 32 + 72 P_{T} & = 104 \end{matrix}$
Since the given total pressure is less than the calculated Total pressure therefore, it shows a negative deviation hence option C is correct.

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The vapour pressure of the solution of two liquids $A (p^{\circ} = 80 m m)$ and $B (p^{\circ} = 120 m m)$ is found to be 100 mm when $X_{A}$ = 0.4. The result shows that

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Q. CASE1: Read the passage given below and answer the following question.

The solution which obeys Raoult’s law over the entire range of concentration are known as ideal solutions. The solution which does not obey Raoults law over the entire range of concentration, then it is called non-ideal solution. The vapour pressure of such as a solution is either higher or lower than that predicted by Raoult’s law. If it is higher, the solution exhibits positive deviation and if it is lower, it exhibits negative deviation from Raoult’s law.
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Which of the following solutions show negative deviation from Raoult’s law?
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The vapour pressure of the solution of two liquids A(po=80mm) and B(po=120mm) is found to be 100mm when xA=0.4. The result shows that:

The correct option is C solution shows negative deviationsP0A=80 mmP∘B=120 mmxn=0.4xB=0.6PT=xAP0A+xBP00=0.4×80+0.6×120=32+72PT=104 Since the given total pressure is less than the calculated Total pressure therefore, it shows a negative deviation hence option C is correct.

The vapour pressure of the solution of two liquids $A (p^{o} = 80 m m$ ) and $B (p^{o} = 120 m m)$ is found to be $100 m m$ when $x_{A} = 0.4$ . The result shows that: