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Test: Colligative Properties - 3 - Chemistry MCQ


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25 Questions MCQ Test Physical Chemistry - Test: Colligative Properties - 3

Test: Colligative Properties - 3 for Chemistry 2024 is part of Physical Chemistry preparation. The Test: Colligative Properties - 3 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Colligative Properties - 3 MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Colligative Properties - 3 below.
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Test: Colligative Properties - 3 - Question 1

The molal freezing point constant for water is 1.86 K kg mol–1. If 34.2 g of cane sugar (C12H22O11) is dissolved in 100 g of water, the solution will freeze at:

Test: Colligative Properties - 3 - Question 2

The ratio of the value of any colligative property for KCl solution to that for sugar is nearly ____ time:

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Test: Colligative Properties - 3 - Question 3

The vapour pressure of a solvent decreased by 10 mm Hg when a non-volatile solute was added to the solvent. The mole fraction of solute in solution is 0.2, what would be mole fraction of the solvent in decrease in vapour pressure is 20 mm of Hg:

Test: Colligative Properties - 3 - Question 4

Y g of non–volatile organic substance of molecular mass M is dissolved in 250 g benzene. Molal elevation constant of benzene is Kb. Elevation in its boiling point is given by:

Test: Colligative Properties - 3 - Question 5

The freezing point of aqueous solution contains 5% by mass urea, 1.0% by mass KCl and 10% by mass of glucose is

Test: Colligative Properties - 3 - Question 6

The values of observed and calculated molecular weights of silver nitrate are 92.64 and 170 respectively. The degree of dissociation of silver nitrate is:

Test: Colligative Properties - 3 - Question 7

Which of the following aqueous solutions has the highest boiling point & minimum freezing point?

Test: Colligative Properties - 3 - Question 8

Among the following the solution which shows the highest osmotic pressure at 25ºC is:

Test: Colligative Properties - 3 - Question 9

If a solute undergoes dimerisation and trimerisation, the minimum values of Vant Hoff factors respectively are:

Test: Colligative Properties - 3 - Question 10

Osmotic pressure of 4% (w/v) urea solution is 1.64 atm and that of 3.42% (w/v) cane sugar is 2.46 atm. When equal volume of the above two solutions are mixed, the osmotic pressure of the resulting solution is:

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 11

When mercuric iodide is added to an aqueous solution of potassium iodide then:

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 12

Which of the following will have same value of Vant Hoff factor (i) as that of K4[Fe(CN)6]:

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 13

If Pº and Ps are the V.P. of solvent and its solution respectively and N1 and N2 are the moles of solute and solvent then:

Detailed Solution for Test: Colligative Properties - 3 - Question 13

If Po​ and Ps​ are the vapour pressures of the solvent and solution respectively, N1​ and N2 are the mole fractions of the solvent and solute respectively, then Ps= Po​N1​. 

According to Raoult's law, the vapour pressure of a solvent above a solution is equal to the vapour pressure of the pure solvent at the same temperature scaled by the mole fraction of the solvent present.

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 14

At constant temperature, the osmotic pressure of a solution is:

Test: Colligative Properties - 3 - Question 15

The value of Ebullioscopic constant or boiling point elevation constant depends on:

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 16

Which of the following pairs of solution are expected to be isotonic at the same temperature:

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 17

Isotonic solution have:

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 18

The Vant Hoff factor is:

Detailed Solution for Test: Colligative Properties - 3 - Question 18

In case of association of solute particles in solution, the observed molecular weight of solute being more than the normal, the value of factor 'i' is less than unity (i.e. i < 1), while for dissociation the value of i is greater than unity (i.e. i > 1), because the observed molecular weight has lesser value than normal molecular weight.

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 19

Ideal solution is formed when to components:

*Multiple options can be correct
Test: Colligative Properties - 3 - Question 20

When a non-volatile solute is added to a pure solvent, which statement(s) hold true:

*Answer can only contain numeric values
Test: Colligative Properties - 3 - Question 21

An aqueous solution of glucose boils at 100.01ºC. The mo lal elevat ion constant for water is 0.5 K Kg mol–1. The number of glucose molecules in the solution containing 100 g of water are x × 1021. The value of x is ______.


*Answer can only contain numeric values
Test: Colligative Properties - 3 - Question 22

The apparent degree of ionization of KCl in water at 290 K is 0.86, the mass of KCl which must be made up to 1 dm3 of aqueous solution so as to produce the same osmotic pressure as the 4% solution of glucose at that temperature is ______g.


*Answer can only contain numeric values
Test: Colligative Properties - 3 - Question 23

An aqueous solution containing 288 g of a non–volatile compound having the stoichiometric composit ion CxH2xOx in 90 g water boils at 101.24ºC at 1 atmospheric pressure. What is the value of x? (Given that: Kb(H2O) = 0.512 K Kg mol–1):


*Answer can only contain numeric values
Test: Colligative Properties - 3 - Question 24

The freezing point of a solution of acetic acid (mole fraction is 0.02) in benzene is 277.4 K. Acetic acid exists partly as a dimer. Freezing point of benzene is 278.4 K and Kf for benzene is 5 K kg mol–1. The equilibrium constant for dimerisation is ______ kg mol–1:


Detailed Solution for Test: Colligative Properties - 3 - Question 24

Hence 3.39 is correct

*Answer can only contain numeric values
Test: Colligative Properties - 3 - Question 25

The relative lowering of vapour pressure of an aqueous solution of a non–volatile solute of molecular weight 60 (which neither dissociates nor associates in the solution) is 0.018. If Kf of water is 1.86º cm–1, the depression in freezing point will be ______ºC.


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