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Solutions (20 Sep) - JEE MCQ


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15 Questions MCQ Test Daily Test for JEE Preparation - Solutions (20 Sep)

Solutions (20 Sep) for JEE 2024 is part of Daily Test for JEE Preparation preparation. The Solutions (20 Sep) questions and answers have been prepared according to the JEE exam syllabus.The Solutions (20 Sep) MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Solutions (20 Sep) below.
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Solutions (20 Sep) - Question 1

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 Solutions (20 Sep) - Question 1

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

Solutions (20 Sep) - Question 2

Which one of the following binary mixtures forms an azeotrope with minimum boiling point type?

Detailed Solution for Solutions (20 Sep) - Question 2
Minimum boiling azeotrope is formed by solution showing positive deviation. e.g. acetone ethanol.
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Solutions (20 Sep) - Question 3

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 Solutions (20 Sep) - Question 3
Total vapour pressure vapour pressure of pure benzene vapour pressure of toluene

We know,

Solutions (20 Sep) - Question 4
Which of the following statement is correct if the intermolecular forces in liquids and are in the order
Detailed Solution for Solutions (20 Sep) - Question 4
Lesser the intermolecular forces, the more the volatile character.
Solutions (20 Sep) - Question 5
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 Solutions (20 Sep) - Question 5
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
Solutions (20 Sep) - Question 6
Which of the following is not correct?
Detailed Solution for Solutions (20 Sep) - Question 6
Ethanol has hydrogen bonding while acetone has dipole-dipole forces. Thus, their mixture would form a non-ideal solution.
Solutions (20 Sep) - Question 7
A solution of acetone in ethanol
Detailed Solution for Solutions (20 Sep) - Question 7
A solution of acetone in ethanol shows positive deviation from Raoult's law. It is because ethanol molecules are strongly hydrogen bonded. When acetone is added, these molecules break the hydrogen bonds and ethanol becomes more volatile. Therefore its vapour pressure is increased.
Solutions (20 Sep) - Question 8
An aqueous solution is molal in KI. Which change will cause the vapour pressure of the solution to increase?
Detailed Solution for Solutions (20 Sep) - Question 8
When the aqueous solution of one molal is diluted with water, concentration decreases, therefore the vapour pressure of the resulting solution increases.
Solutions (20 Sep) - Question 9
and are the vapour pressure of pure liquid components, and , respectively of an ideal binary solution. If represents the mole fraction of component , the total pressure of the solution will be.
Detailed Solution for Solutions (20 Sep) - Question 9



Solutions (20 Sep) - Question 10
Which condition is not satisfied by an ideal solution?
Detailed Solution for Solutions (20 Sep) - Question 10

For an ideal solution,

Volume change of mixing should be zero.

Heat change on mixing should be zero.

Obey Raoult's law every range of concentration.

Solutions (20 Sep) - Question 11

The difference between the boiling point and freezing point of an aqueous solution containing sucrose (molecular in of water is . If and of water are and respectively, the weight of sucrose in the solution is about

Detailed Solution for Solutions (20 Sep) - Question 11




i.e., moles in water
(or) moles in water
∴ Wt. of sucrose

Solutions (20 Sep) - Question 12

A solution containing 1.8 g of a compound (empirical formula CH2O) in 40 g of water is observed to freeze at −0.465C. The molecular formula of the compound is (Kf of water = 1.86 kg K mol−1)

Detailed Solution for Solutions (20 Sep) - Question 12




Molecular formula
Molecular formula

Solutions (20 Sep) - Question 13
Freezing point of an aqueous solution is . If the values of and of water are respectively and , then the elevation of boiling point of the solution in is
Detailed Solution for Solutions (20 Sep) - Question 13



Solutions (20 Sep) - Question 14

Which one of the following statements is incorrect?

Detailed Solution for Solutions (20 Sep) - Question 14

ΔTf = K× m × i.
Since Kf has different values for different solvents, hence even if m is the same ΔTf will be different

Solutions (20 Sep) - Question 15
and atm are the osmotic pressures of (mass/volume) solutions of urea, fructose, sucrose and respectively at certain temperature. The correct order of their magnitudes is :
Detailed Solution for Solutions (20 Sep) - Question 15
Moles of urea ;
moles of fructose

moles of sucrose

moles of (effective)


this order is
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