JEE Questions for Chemistry Solutions Quiz 9 - MCQExams.com

The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is
  • 1 g
  • 3 g
  • 6 g
  • 18 g
A 5.25% solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol-1) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm-3, molar mass of the substance will be
  • 90.0 g mol-1
  • 115.0 g mol-1
  • 105.0 g mol-1
  • 210.0 g mol-1
Which one of the following statements is false ?
  • Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction
  • The osmotic pressure (π) of a solution is given by the equation π = MRT , where, M is the molarity of the solution
  • The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl2 > KCl > CH3 COOH > sucrose
  • Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression
Which of the following is incorrect ?
  • Relative lowering of vapour pressure is independent of the nature of the solute and the solvent.
  • The relative lowering of vapour pressure is a colligative property.
  • Vapour pressure of a solution is lower than the vapour pressure of the solvent.
  • The relative lowering of vapour pressure is directly proportional to the original pressure.
If the various terms in the below given expressions have usual meanings, the van't Hoff factor (i) cannot be calculated by which one of the expressions ?

  • Chemistry-Solutions-7089.png
  • 2)
    Chemistry-Solutions-7090.png

  • Chemistry-Solutions-7091.png

  • Chemistry-Solutions-7092.png
You are given 100 cc of CCl4 to extract iodine from 200 cc of its aqueous solution. For extracting maximum amount of iodine which one of the following processes would you adopt ?
  • use of 100 cc of CCl4 once
  • use of 50 cc of CCl4 twice
  • use of 10 cc of CCl4 ten times
  • use of 25 cc of CCl4 four times
Solubility curve of Na2SO4 .10H2O in water with temperature is given as
Chemistry-Solutions-7093.png
  • Solution process is exothermic
  • Solution process is exothermic till 34oC and endothermic after 34oC
  • Solution process is endothermic till 34oC and exothermic thereafter
  • Solution process is endothermic
If n2 moles of solute are dissolved in n1 moles of the solvent, Raoult’s law is expressed mathematically as

  • Chemistry-Solutions-7094.png
  • 2)
    Chemistry-Solutions-7095.png

  • Chemistry-Solutions-7096.png

  • Chemistry-Solutions-7097.png
Which of the following plots does not represent the behaviour of an ideal binary liquid solution?
  • Plot of pA versus xA (mole fraction of A in liquid phase) is linear
  • Plot of pB versus xB is linear
  • Plot of ptotal versus xA (or xB) is linear
  • Plot of ptotal versus xA is non-linear.
Which of the following is correct for a solution showing positive deviations from Raoult’s law?
  • ∆ V = + Ve, ∆ H = + Ve
  • ∆ V = ‒ Ve, ∆ H = ‒ Ve
  • ∆ V = + Ve, ∆ H = ‒ Ve
  • ∆ V = ‒ Ve, ∆ H = + Ve
The diagram given below is a vapour pressure-composition diagram for a binary solution of A and B. In the solution, A-B interactions are
  • Similar to A-A and B-B interactions
  • greater than A-A and B-B interactions
  • Smaller than A-A and B-B interactions
  • Unpredictable
A binary solution of ethanol and n-heptane is an example of
  • Ideal solution
  • Non-ideal solution with +ve deviation
  • Non-ideal solution with –ve deviation
  • Unpredictable behaviour
Colligative properties of solutions are those which depend upon
  • the nature of the solvent
  • the nature of the solute
  • the number of solvent molecules
  • the number of solute particles
Two aqueous solution S1 and S2 are separated by a semi-permeable membrane.S2 has lower vapour pressure than S1. Then
  • More solvent will flow from S1 to S2
  • More solvent will flow from S2 to S1
  • Solvent from S1 and S2 will flow at equal rates
  • No flow will take place
Which statement is incorrect about osmotic pressure (P), volume (V) and temperature (T)?

  • Chemistry-Solutions-7099.png
  • 2)
    Chemistry-Solutions-7100.png

  • Chemistry-Solutions-7101.png

  • Chemistry-Solutions-7102.png
n moles of a solute are dissolved in w g of water. If Kf is the molal depression constant of water, the freezing point of the solution will be

  • Chemistry-Solutions-7104.png
  • 2)
    Chemistry-Solutions-7105.png

  • Chemistry-Solutions-7106.png

  • Chemistry-Solutions-7107.png
The molecular mass of a solute cannot be calculated by one of the following relations

  • Chemistry-Solutions-7109.png
  • 2)
    Chemistry-Solutions-7110.png

  • Chemistry-Solutions-7111.png

  • Chemistry-Solutions-7112.png
Molal depression constant is calculated from the enthalpy of fusion (∆Hf ) and b.pt. of solvent using the relation

  • Chemistry-Solutions-7113.png
  • 2)
    Chemistry-Solutions-7114.png

  • Chemistry-Solutions-7115.png

  • Chemistry-Solutions-7116.png
Which of the following aqueous solution do you expect to have the lowest freezing point?
  • 0.1m glucose (C6H12O6)
  • 0.1 m NaCl
  • 0.1 m sucrose (C12H22O11)
  • 0.1 m BaCl2
The van’t Hoff’s factor (i) for a 0.2 molal aqueous solution of urea is
  • 0.2
  • 0.1
  • 1.2
  • 1.0
If a substance undergoes association or dissociation in the solution and i is the van’t Hoff factor, then the expression for osmotic pressure is
  • iP = CRT
  • 2)
    Chemistry-Solutions-7118.png
  • PV = inRT
  • PV = nRT/i
Benzoic acid undergoes dimerisation in benzene solution, the van’t Hoff factor ‘i’ is related to the degree of association ‘x’ of the acid as
  • i = (1 – x)
  • i = (1 + x)
  • i = (1 – x/2)
  • i = (1 + x/2)
For a dilute solution, Raoult’s law states that
  • The lowering of vapour pressure is equal to the mole fraction of the solute
  • The relative lowering of vapour pressure is equal to the mole fraction of the solute
  • The relative lowering of vapour pressure is equal to the amount of the solute in the solution
  • The vapour pressure of the solution is equal to the mole fraction of the solvent.
The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows
  • negative deviations from Raoult’s law
  • positive deviations from Raoult’s law
  • no deviation from Raoult’s law
  • deviations which cannot be predicted from the given information.
When mercuric iodide is added to the aqueous solution of potassium iodide, the
  • freezing point is raised
  • freezing point is lowered
  • freezing point does not change
  • boiling point does not change
Which of the following modes of expressing concentration is independent of temperature?
  • Molarity
  • Molality
  • Formality
  • Normality
An ideal solution is formed when its components
  • have no volume change on mixing
  • have no enthalpy change on mixing
  • have both the above characteristics
  • have high solubility
In cold countries, ethylene glycol is added to water in the radiators of cars during winters. This is results in
  • lowering of F.P
  • reducing the viscosity
  • reducing the specific heat
  • making water a better conductor of electricity.
Which of the following aqueous solution has minimum freezing point?
  • 0.01m NaCl
  • 0.005m C2H5OH
  • 0.005m MgI2
  • 0.005m MgSO4
If 0.1 M solution of glucose and 0.1 M solution of urea are placed on two sides of the semipermeable membrane to equal heights, then it will be correct to say that
  • There will be no net movement across the membrane
  • Glucose will flow towards urea solution
  • urea will flow towards glucose solution
  • water will flow from urea solution to glucose solution
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