1 mole of liquid A and 2 moles of liquid B make a solution ...

CBSE Class 12 Chemistry 2023 All Sets Solved Paper

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

is an ideal solution
shows positive deviation
shows negative deviation
is a maximum boiling azeotrope

Solution:

P_total=X_AP^ ∘_A+X_BP^ ∘_B

\;{1}/{3}× 45+\;{2}/{3}×30

= 15 + 20

P_total

= 35 torr

∵ P_total

= 35 torr
but actual pressure is 40 torr, thus shows that solution shows positive deviation from ideal solution.

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