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Question

In an ideal solution of non-volatile solute B in solvent A in 2: 5 molar ratio has vapour pressure 250 mm. If another solution in ratio 3: 4 prepared then vapour pressure above this solution is:

A
200 mm
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B
250 mm
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C
350 mm
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D
400 mm
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Solution

The correct option is C 200 mm
Given molar ratio=2:5 v.p =250 mm(one solute)

Moral ratio =3:4v.p=?(another solute)

Mole fraction of solven =52+5=54=0.71(1stsolute)

According to Raoult's law;

p (solution)× mole fraction of solven250=p(pure solvent)0.71

p(pure solvent)=2500.71=352.11 mm

mole fraction of solvent =43+4=47=0.57

p(solution)=352.11×0.57=200.7200 mm

Hence, the correct option is A

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