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# Liquids A and B form an ideal solution. At

Question:

Liquids A and B form an ideal solution. At $30^{\circ} \mathrm{C}$, the total vapour pressure of a solution containing $1 \mathrm{~mol}$ of $\mathrm{A}$ and 2 moles of B is $250 \mathrm{~mm} \mathrm{Hg}$. The total vapour pressure becomes $300 \mathrm{~mm} \mathrm{Hg}$ when 1 more mol of $\mathrm{A}$ is added to the first solution. The vapour pressures of pure $\mathrm{A}$ and $\mathrm{B}$ at the same temperature are

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1. 450, 150 mm Hg

2.  250, 300 mm Hg

3. 125, 150 mm Hg

4.  150, 450 mm Hg

Correct Option: 1

Solution: