JEE Questions for Chemistry Solutions Quiz 4 - MCQExams.com

van't Hoff factor of Ca(NO3 )2 is
  • one
  • two
  • three
  • four
Phenol dimerises in benzene having van't Hoff factor 0.54. What is the degree of association ?
  • 1.92
  • 0.98
  • 1.08
  • 0.92
If α is the degree of dissociation of Na2SO4, the van't Hoff factor (i) used for calculating the molecular mass is
  • 1 – 2α
  • 1 + 2α
  • 1 – α
  • 1 + α
The van't Hoff factor of BaCl2 at 0.01 M concentration is 1.98. The percentage of dissociation of BaCl2 at this concentration is
  • 49
  • 69
  • 89
  • 98
  • 100
Distribution law was given by
  • Henry
  • van't Hoff
  • Nernst's
  • Ostwald
If molality of the dilute solutions is doubled, the value of molal depression constant (Kf) will be:-
  • halved
  • tripled
  • unchanged
  • doubled
Two solutions of HCl, A and B have concentrations of 0.5 N and 0.1 M respectively. The volume of solutions A and B required to make 2L of 0.2 N HCl are
  • 0.5 L of A + 1.5 L of B
  • 1.5 L of A + 0.5 L of B
  • 1.0 L of A +1.0 L of B
  • 0.75 L of A + 1.25 L of B
The density of a 3M sodium thiosulphate (Na2S2O3 ) solution is 1.25 g/mL. Calculate the per cent by weight of sodium thiosulphate.
  • 12.65%
  • 37.92%
  • 0.87%
  • 63.21%
How many grams of sulphuric acid is to be dissolved to prepare 200 mL aqueous solution having concentration of [H3O+ ] ions 1 M at 25°C temperature.
[H = 1, O = 16, S= 32 g ∙ mol-1]
  • 4.9 g
  • 19.6 g
  • 9.8 g
  • 0.98 g
50 cm3 of 0.2 N HCl is titrated against 0.1 N NaOH solution. The titration is discontinued after adding 50 cm3 of NaOH. The remaining titration is completed by adding 0.5 N KOH. The volume of KOH required for completing the titration is
  • 12 cm3
  • 10 cm3
  • 25 cm3
  • 10.5 cm3
Two bottles A and B contains 1M and 1m aqueous solution of sulphuric acid respectively
  • A is more concentrated than B
  • B is more concentrated than A
  • concentration of A is equal to concentration of B
  • it is not possible to compare the concentrations
Which of the following concentration factors is affected by change in temperature ?
  • Molarity
  • Molality
  • Mole fraction
  • Weight fraction
The density (in g mL-1) of a 3.60 M sulphuric acid solution that is 29% H2 SO4 (molar mass = 98 g mol-1) by mass will be
  • 1.64
  • 1.88
  • 1.22
  • 1.45
25 mL of a solution of barium hydroxide on titration with 0.1 molar solution of hydrochloric acid gave a titre value of 35 mL. The molarity of barium hydroxide solution was
  • 0.07
  • 0.14
  • 0.28
  • 0.35
The volume of 10 N and 4 N HCl required to make 1L of 7 N HCl are
  • 0.50 L of 10 N HCl and 0.50 L of 4 N HCl
  • 0.60 L of 10 N HCl and 0.40 L of 4 N HCl
  • 0.80 L of 10 N HCl and 0.20 L of 4 N HCl
  • 0.75 L of 10 N HCl and 0.25 L of 4 N HCl
Which one is correct?
  • Molality changes with temperature
  • Molality does not change with temperature.
  • Molarity does not change with temperature.
  • Normality does not change with temperature.
40% by weight solution will contain how much mass of the solute in 1 L solution, density of the solution is 1.2 g/mL ?
  • 480 g
  • 48 g
  • 38 g
  • 380 g
Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
  • 1.14 mol kg-1
  • 3.28 mol kg-1
  • 2.28 mol kg-1
  • 0.44 mol kg-1
Which of the following concentration terms is/are independent of temperature?
  • Molarity
  • Molarity and mole fraction
  • Mole fraction and molality
  • Molality and normality
  • Only molality
35.4 mL of HCl is required for the neutralisation of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is
  • 0.97 N
  • 0.142 N
  • 0.194 N
  • 0.244 N
A solution contains 1.2046 ×1024 hydrochloric acid molecules in 1 dm3 of the solution. The strength of the solution is
  • 6 N
  • 2 N
  • 4 N
  • 8 N
What is molarity of K+ in aqueous solution that contains 17.4 ppm of K2SO4 (174 gmol-1)?
  • 2 × 10-2 M
  • 2 × 10-3 M
  • 4 × 10-4 M
  • 2 × 10-4 M
Assuming that sea water is a 3.50 weight per cent aqueous solution of NaCl. What is the molality of sea water ?
  • 0.062 m
  • 0.0062 m
  • 0.62 m
  • 6.2 m
Two solutions of a substance (non-electrolyte) are mixed in the following manner. 480 mL of 1.5 M (first solution) + 520mL of 1.2 M second solution.
What is the molarity of the final mixture ?
  • 2.70 M
  • 1.344 M
  • 1.50 M
  • 1.20 M
A solution is prepared by dissolving 24.5 g of sodium hydroxide in distilled water to give 1L solution. The molarity of NaOH in the solution is
(Given, that molar mass of NaOH = 40.0 g mol-1 )
  • 0.2450 M
  • 0.6125 M
  • 0.9800 M
  • 1.6326 M
Benzene and naphthalene form an ideal solution at room temperature. For this process, the true statement(s) is are
  • ∆Ssystem is positive
  • ∆Ssurroundings = 0
  • ∆H = 0
  • All of these
Identify the mixture that shows positive deviation from Raoult's law.
  • CHCl3 + (CH3)2 CO
  • (CH3)2 CO + C6H5NH
  • CHCl3+ C6H6
  • (CH3 )2 CO + CS2
  • C6H5N + CH3COOH
A solution of two liquids boils at a temperature more than the boiling point of either them. Hence, the binary solution shows
  • negative deviation from Raoult's law
  • positive deviation from Raoult's law
  • no deviation from Raoult's law
  • positive or negative deviation from Raoult's law depending upon the composition
On mixing, heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components (heptane and octane) are 105 kPa and 45 kPa respectively. Vapour pressure of the solution obtained by mixing 25 g of heptane and 35 g of octane will be (molar mass of heptane = 100 g mol-1 and of octane = 114 g mol-1).
  • 72.0 kPa
  • 36.1 kPa
  • 96.2 kPa
  • 144.5 kPa
The vapour pressure of a pure liquid A is 40 mm Hg at 310 K. The vapour pressure of this liquid in a solution with liquid B is 32 mm Hg. What is the mole fraction of A in the solution if it obeys the Raoult's law ?
  • 0.5
  • 0.6
  • 0.7
  • 0.8
0:0:1


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