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Question

Two liquids A and B form an ideal solution. What is the vapour pressure of solution containing 2 moles of A and 3 moles of B at 300 K?

[Given: At 300 K, vapour pressure of pure liquid A(PA)=100 torr, Vapour pressure of pure liquid B(PB)=300 torr].

A
200 torr
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B
220 torr
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C
180 torr
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D
None of these
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Solution

The correct option is A 220 torr
xA=22+3=25,xB=35
Vapour pressure of solution
=xAPoA+xBPoB [Raoult's Law]
=25×100+35×300
=220 torr

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