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CBSE Class 12 Chemistry 2023 All Sets Solved Paper

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Question : 7 of 18
Marks: +1, -0
1 mole of liquid A and 2 moles of liquid B make a solution having a total vapour pressure 40 torr. The vapour pressure of pure A and pure B are 45 torr and 30 torr respectively. The above solution
Solution:  
Ptotal=XAPA∘+XBPB∘P_{\text{total}} = X_A P^\circ_A + X_B P^\circ_B
=   13×45+  23×30\; \frac{1}{3} \times 45 + \; \frac{2}{3} \times 30
= 15 + 20
PtotalP_{\text{total}} = 35 torr
∵Ptotal\because P_{\text{total}} = 35 torr
but actual pressure is 40 torr, thus shows that solution shows positive deviation from ideal solution.
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