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Home
Class 12
CHEMISTRY
1 mole of liquid A and 9 moles of liquid...

1 mole of liquid A and 9 moles of liquid B are mixed to form a solution. If `"P"_("B")^(@)=400"mm"` of Hg and `"P"_("A")^(@)=20 "mm"` of Hg at a temperature 'T' and normal boiling point of liquid B is 300K then answer the questions that follow.
Given data: `"K"_("b")=2.7"K kg mol"^(-1),` Molar mass of B=100
It is observed that pressure of vapour above the solution at 'T' Kelvin is 350 mm Hg. The true statement is :

A

The liquids form ideal solution.

B

The solute- solvent interactions are weaker than solvent- solvent or solute- solute interactions.

C

The volume of final solution will be lower than sum of individual volumes

D

The enthalpy change due to mixing will be zero.

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Text Solution

Verified by Experts

The correct Answer is:
C
P=350 mm of Hg
`"P"_("T")="P"_("A")^(@)"x"_("A")+"P"_("B")^(@)"x"_("B")`
`20xx1/10+400xx9/10=362`
`"P"lt"P"_("T")`
-ve deviation
`Delta"V"_("mix")lt0`
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Knowledge Check

  • 1 mole of liquid A and 9 moles of liquid B are mixed to form a solution. If "P"_("B")^(@)=400"mm" of Hg and "P"_("A")^(@)=20 "mm" of Hg at a temperature 'T' and normal boiling point of liquid B is 300K then answer the questions that follow. Given data: "K"_("b")=2.7"K kg mol"^(-1), Molar mass of B=100 If 'A' is assumed to be perfectly non volatile then what will be normal boiling point of the solution.

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  • 1 mole of liquid A and 9 moles of liquid B are mixed to form a solution. If "P"_("B")^(@)=400"mm" of Hg and "P"_("A")^(@)=20 "mm" of Hg at a temperature 'T' and normal boiling point of liquid B is 300K then answer the questions that follow. Given data: "K"_("b")=2.7"K kg mol"^(-1), Molar mass of B=100 If 'A' is perfectly non volatile and it dimerises to and extent of 60% then what will be the vapour pressure of the solution.

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