In a mixture of liquids $A$ and $B$, if the mole fractions of component $A$ in vapour phase and liquid mixture are $x_1$ and $x_2$ respectively, then the total vapour pressure of liquid mixture is (where $P_{A}^{\circ}$ and $P_{B}^{\circ}$ are the vapour pressures of pure $A$ and $B$)
- A$\frac{P_{B}^{\circ} x_1}{x_2}$
- B$\frac{P_{B}^{\circ} x_2}{x_1}$
- C$\frac{P_{A}^{\circ} x_2}{x_1}$
- D$\frac{P_{A}^{\circ} x_1}{x_2}$
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