JEE Questions for Chemistry Solutions Quiz 8 - MCQExams.com

What is the molarity of H2SO4 solution that has a density 1.84 gm/cc at 35oC and contains 98% H2SO4 by weight?
  • 4.18 M
  • 8.14 M
  • 18.4 M
  • 18 M
The normality of 1 M H3PO4 is
  • 1 N
  • 0.5 N
  • 2 N
  • 3 N
98 g H2SO4 is present in one litre. The solution is
  • 1 molar
  • 1 normal
  • 1 molal
  • 2 molar
The molarity of a solution prepared by adding 7.1g of Na2SO4 (formula weight 142u) to enough water to make 100 ml volume is
  • 2.0 M
  • 1.0 M
  • 0.5 M
  • 0.05 M
The molarity of pure water is
  • 55.6
  • 50
  • 100
  • 18
The mole fraction of water in 20% aqueous solution of H2O2 is

  • Chemistry-Solutions-7063.png
  • 2)
    Chemistry-Solutions-7064.png

  • Chemistry-Solutions-7065.png

  • Chemistry-Solutions-7066.png
How many grams of CH3OH would have to be added to water to prepare 150 ml of a solution that is 2.0 M CH3OH ?
  • 9.6
  • 2.4
  • 9.6 × 103
  • 4.3 × 102
A sugar syrup of weight 214.2 grams contains 34.2 grams of water. The molal concentration is
  • 0.55
  • 5.5
  • 55
  • 0.1
An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 ml. The volume of 0.1 N NaOH required to completely neutralize 10 ml of this solution is
  • 40 ml
  • 20 ml
  • 10 ml
  • 4 ml
The osmotic pressure of a solution at 0oC is 4 atmospheres. What will be its osmotic pressure at 546 Å under similar conditions?
  • 4 atm
  • 2 atm
  • 8 atm
  • 1 atm
The osmotic pressure in atmospheres of 10% solution of cane sugar at 69oC is
  • 724
  • 824
  • 8.21
  • 7.21
Osmotic pressure is 0.0821 atm at a temperature of 300 K. Find concentration in mole/litre
  • 0.033
  • 0.066
  • 0.33 × 10-2
  • 3
If the elevation in boiling point of a solution of 10 gm of solute (mol. wt. =in 100 gm of water is ∆Tb, the ebullioscopic constant of water is
  • 10
  • 10 ∆Tb
  • ∆Tb
  • ∆Tb/10
The depression in freezing point of 0.01 M aqueous solutions urea, sodium chloride and sodium sulphate is in the ratio of
  • 1 : 1 : 1
  • 1 : 2 : 3
  • 1 : 2 : 4
  • 2 : 2 : 3
The degree of dissociation (α) of a weak electrolyte Ax By is related to van’t Hoff factor (i) by the expression

  • Chemistry-Solutions-7074.png
  • 2)
    Chemistry-Solutions-7075.png

  • Chemistry-Solutions-7076.png

  • Chemistry-Solutions-7077.png
The solute remains as dimer in the m-molal solution; then elevation in boiling point irrelevant with the solution is -

  • Chemistry-Solutions-7079.png
  • 2)
    Chemistry-Solutions-7080.png

  • Chemistry-Solutions-7081.png

  • Chemistry-Solutions-7082.png

Chemistry-Solutions-7084.png
  • 0.50, 0.50
  • 0.75, 0.25
  • 0.67, 0.33
  • 0.25, 0.75
  • 0.33, 0.67
The Henry's law constant for the solubility of N2 gas in water at 298 K is 1.0 × 105 atm. The mole fraction of N2 in air is 0.8. The number of mols of N2 from air dissolved in 10 moles of water of 298 K and 5 atm pressure is
  • 4 × 10-4
  • 4.0 × 10-5
  • 5.0 × 10-4
  • 4.0 × 10-6
At STP. a container has 1 mole of Ar, 2 moles of CO2, 3 moles of O2 and 4 moles of N2. Without changing the total pressure if one mole of O2 is removed, the partial pressure of O2 is
  • changed by about 16%
  • halved
  • changed by 26%
  • unchanged
Two liquids X and Y form an ideal solution at 300 K, vapour pressure of the solution containing 1 mol of X and 3, mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mmHg. Vapour pressure (in mmHg) of X and Y in their pure states will be, respectively
  • 200 and 300
  • 300 and 400
  • 400 and 600
  • 500 and 600
A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be
  • 350
  • 300
  • 700
  • 360
Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20°C for a solution containing 78 g of benzene and 46 g of toluene in torr is
  • 53.5
  • 37.5
  • 25
  • 50
At the same temperature which of the following solutions will be isotonic?
  • 3.42 gm of sucrose per litre of water and 0.18 gm glucose per litre of water.
  • 3.42 gm of sucrose per litre and 0.18 gm glucose in 0.1 litre of water.
  • 3.42 gm of sucrose per litre of water and 0.585 gm of sodium chloride per litre of water.
  • 3.42 gm of sucrose per litre of water and 1.17 gm of sodium chloride per litre of water.
A molal solution is one that contains one mole of a solute in
  • 1000 g of the solvent
  • One litre of the solvent
  • One litre of the solution
  • 22.4 litres of the solution
Which inorganic precipitate acts as a semipermeable membrane?
  • Calcium phosphate
  • Nickel phosphate
  • Calcium sulphate
  • Copper ferrocyanide
The best and accurate method for determining osmotic pressure is
  • Negative pressure method
  • Berkeley and Hartley method
  • Morse and Frazer method
  • Preffer’s method
Consider separate solution of 0.500 M C2H5OH(aq), 0.100 M Mg3 (PO4)2 (aq), 0.250 M KBr (aq) and 0.125 M Na3PO4 (aq)2 at 25° C. Which statement is true about these solution assuming all salts to be strong electrolytes.
  • They all have same osmotic pressure
  • 0.100 M Mg3 (PO4)2 (aq) has the highest osmotic pressure
  • 0.125 M Na3PO4 (aq) has the highest osmotic pressure
  • 0.500 M C2H5OH(aq) has the highest osmotic pressure
A 1% solution of KCl (I), NaCl (II), BaCl2 (III) and urea (IV) have their osmotic pressure at the same temperature in the ascending order (molar masses of NaCl, KCl, BaCl2 and urea are respectively 58.5, 74.5, 208.4 and 60 g. mol-1). Assume 100% ionisation of the electrolytes at this temperature
  • I < III < II < IV
  • III < I < II < IV
  • I < II < III < IV
  • I < III < IV < II
  • III < IV < I < II
The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A non-volatile and non-electrolyte solid weighing 2.175 g is added to 39.08 g of benzene. If the vapour pressure of the solution is 600 mm of Hg, what is the molecular weight of solid substance ?
  • 49.50
  • 59.60
  • 69.60
  • 79.82
Consider the following aqueous solutions and assume 100% ionisation in electrolytes
I. 0.1 m urea
II. 0.04 m Al2(SO4)3
III. 0.05 m CaCl2
IV. 0.005 m NaCl
The correct statement regarding the above solution is
  • freezing point will be lowest for solution I
  • freezing point will be highest for solution IV
  • boiling point will be highest for solution IV
  • vapour pressure will be highest for solution II
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