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Test: Raoult's and Henry's law - JEE MCQ


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15 Questions MCQ Test - Test: Raoult's and Henry's law

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Test: Raoult's and Henry's law - Question 1

A 5.2 molal aqueous solution of methyl alcohol (CH3OH) is supplied. What is the mole fraction of methyl alcohol in the solution?

Detailed Solution for Test: Raoult's and Henry's law - Question 1

Test: Raoult's and Henry's law - Question 2

Two 1-litre flask and are connected to each other by a valve which is closed. Flask A has benzene in equilibrium with its vapours at . The flask , is evacuated, and the valve is opened. Which of the following is true. If temperature is kept constant.'

Detailed Solution for Test: Raoult's and Henry's law - Question 2
There is no change in vapour pressure.
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Test: Raoult's and Henry's law - Question 3

All form ideal solution except

Detailed Solution for Test: Raoult's and Henry's law - Question 3
and OH form non-ideal solution.
Test: Raoult's and Henry's law - Question 4

Vapour pressure (in torr) of an ideal solution of two liquids and is given by : where is the mole fraction of in the mixture. The vapour pressure (in torr) of equimolar mixture of the two liquids will be :

Detailed Solution for Test: Raoult's and Henry's law - Question 4

Total V.P.,


Thus, torr
or torr
Hence torr

Test: Raoult's and Henry's law - Question 5

The vapour pressure (at the standard boiling point of water) of an aqueous solution containing by mass of a non-volatile normal solute (molecular mass = 28)  will be

Detailed Solution for Test: Raoult's and Henry's law - Question 5

Moles of solute ;
moles of water
V.P. of solution
torr

Test: Raoult's and Henry's law - Question 6
At a particular temperature, the vapour pressures of two liquids and are respectively 120 and of mercury. If 2 moles of and 3 moles of are mixed to form an ideal solution, the vapour pressure of the solution at the same temperature will be (in mm of mercury)
Detailed Solution for Test: Raoult's and Henry's law - Question 6
Vapour pressure of solution

Test: Raoult's and Henry's law - Question 7
Which one of the following binary mixtures forms an azeotrope with minimum boiling point type?
Detailed Solution for Test: Raoult's and Henry's law - Question 7
Minimum boiling azeotrope is formed by solution showing positive deviation. e.g. acetone ethanol.
Test: Raoult's and Henry's law - Question 8
The vapour pressure of pure benzene and toluene at a particular temperature are and respectively. Then the mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene is
Detailed Solution for Test: Raoult's and Henry's law - Question 8
Total vapour pressure vapour pressure of pure benzene vapour pressure of toluene

We know,

Test: Raoult's and Henry's law - Question 9

A solution at is composed of of benzene and of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are torr and torr, respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively :

Detailed Solution for Test: Raoult's and Henry's law - Question 9

Total V.P. of solution
Given, torr, torr



Total V.P. of solution
torr
torr torr
Mole fraction of benzene in vapour form

Test: Raoult's and Henry's law - Question 10
Pick the correct statement.
Detailed Solution for Test: Raoult's and Henry's law - Question 10
Relative lowering of vapour pressure is , which is equal to mole fraction of solute which is independent of temperature.
Test: Raoult's and Henry's law - Question 11

For an ideal solution of two components and B, which of the following is true?

Detailed Solution for Test: Raoult's and Henry's law - Question 11

Solutions in which solute - solute and solvent-solvent interactions are almost similar to solute solvent interactions are known as ideal solution.

Test: Raoult's and Henry's law - Question 12
Which one of the following gases has the lowest value of Henry's law constant?
Detailed Solution for Test: Raoult's and Henry's law - Question 12
According to Henry's law the mass of a gas dissolved per unit volume of solvent is proportional to the pressure of the gas at constant temperature i.e. as the solubility increases, value of Henry's law constant decreases. Since is most soluble in water among the given set of gases. Therefore has the lowest value of Henry's law constant.
Test: Raoult's and Henry's law - Question 13
Which of the following statement is correct if the intermolecular forces in liquids and are in the order
Detailed Solution for Test: Raoult's and Henry's law - Question 13
Lesser the intermolecular forces, the more the volatile character.
Test: Raoult's and Henry's law - Question 14
At and 1 atmosphere partial pressure of hydrogen, of hydrogen measured at STP dissolves in of water. If water at is exposed to a gaseous mixture having a total pressure of of (excluding the vapour pressure of water) and containing hydrogen by volumne, then the volume of hydrogen measured at STP that will dissolve in 1 L of water is
Detailed Solution for Test: Raoult's and Henry's law - Question 14
From the given data
of atmosphere
atmosphere If 's are volumes of gas dissolved by same volume of liquid, then from Henry's law
; or
or
Test: Raoult's and Henry's law - Question 15

100 mL of liuqid 'A' was mixed with 25 ml of a liquid 'B' to give a non-ideal solution of A-B mixture showing (-) ve deviation from Raoult's law. The volume of this mixture would be

Detailed Solution for Test: Raoult's and Henry's law - Question 15

When two liquids form a non-ideal solution which exhibits a (-) ve deviation from Raoult's law, the volume change on mixing the two components is always negative, i.e., ΔVmix < 0 . Hence, the volume of solution cannot be equal to or greater than 125 mL, but is slightly less than 125 mL.

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