Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2at 298 K are 200 mm Hg and 415 mm Hg respectively. The vapour pressure of the solution prepared by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at 298 K is 347.9 mm Hg.

The mole fractions of each component, that is, CHCl
3 and CH2Cl2 in vapour phase are respectively:

0.82; 0.18
2. 0.16; 0.84
3. 0.18; 0.82
4. 0.84; 0.16

 

Subtopic:  Raoult's Law |
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The osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C is:

1. 37 Pa
2. 35 Pa
3. 31 pa
4. 41 Pa
Subtopic:  Osmosis & Osmotic Pressure |
 59%
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If A (volatile solute) and B (volatile solvent) form an azeotropic mixture then the correct statement regarding the above azeotropic mixture will be - 
 
1. Mole fraction of A in the vapour phase is more than the mole fraction of A or B in liquid phase 
2. Mole fraction of A or B in the vapour phase is more than the mole fraction of A or B in liquid phase 
3. Mole fraction of A or B in the vapour phase is same as the mole fraction of A or B in liquid phase
4. Mole fraction of A and B in the vapour phase is less than the mole fraction of A or B in liquid phase 
Subtopic:  Azeotrope |
 65%
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 Acetic acid dimerises in benzene . The value of Van't Hoff factor (i) for the dimerisation of acetic acid is 0.7.  The percetage dimerisation of acetic acid will be-
1. 30%  2. 60% 
3. 70%  4. 90%  
Subtopic:  Van’t Hoff Factor |
 64%
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The boiling point of 1M Urea solution is 101°C. At the same conditions of temperature and pressure, the boiling point of 1M KCl solution will be (Assume that KCl is 100% dissociated)
1. 102°C
2. 202°C
3. 104°C
4. Data insufficient 
Subtopic:  Elevation of Boiling Point |
 58%
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A mixture of ethanol and water shows a positive deviation from Raoult's law. This mixture also forms an azeotropic mixture. The boiling point of this azeotropic mixture will be 
 
1. Less than the boiling point of water but more than the boiling point of ethanol 
2. More than the boiling point of water but less than the boiling point of ethanol
3. More than the boiling point of ethanol as well as water 
4. Less than the boiling point of ethanol as well as water 
Subtopic:  Azeotrope |
 70%
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Which of the following solutions has the minimum freezing point? 
1. 0.02 M NaCl 
2. 0.05 M Urea 
3. 0.01 M \(MgCl_2\)
4. 0.01 M KCl
Subtopic:  Van’t Hoff Factor |
 61%
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In which of the following cases, value of the Van't Hoff factor (i) is the highest? 
1. \(NaCl~ (dissociation = 90\%)\)
2. \(CaF_2~ (dissociation = 80\%)\)
3. \(K_4[Fe(CN)_6]~ (dissociation = 50\%)\)
4. \(AlCl_3~ (dissociation = 70\%)\)
Subtopic:  Van’t Hoff Factor |
 64%
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Glucose is added to 1 litre of water to such an extent that \(\Delta T_f/K_f\) becomes equal to 1/1000. The amount of glucose added is-

1. 180 g
2. 18 g
3. 1.8 g
4. 0.18 g
Subtopic:  Depression of Freezing Point |
 78%
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Choose a false statement among the following:

1.  Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction.
2.  The osmotic pressure (\(\pi\)) of a solution is given by the equation \(\pi\)=MRT, where M is the molarity of the solution.
3.  The correct order of osmotic pressure for 0.10 M aqueous solution of each compound is BaCl2 > KCl > CH3COOH > sucrose.
4.  Two sucrose solutions of the same molarity prepared in different solvents will have the same depression in the freezing point. 

Subtopic:  Depression of Freezing Point | Raoult's Law |
 73%
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