The latent heat of vapourisation of water is 540 cal g-1 at 100°C. Kb for water is

1. 0.56 K.mole-1

2. 1.86 K.mole-1

3. 0.51 K.mole-1

4. 5.12 K.mole-1

 

Subtopic:  Elevation of Boiling Point |
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Which of the following aqueous solution has osmotic pressure nearest to that an equimolar solution of K4[Fe(CN)6]?

1. Na2SO4

2. BaCl2

3. Al2(SO4)3

4. C12H22O11

Subtopic:  Osmosis & Osmotic Pressure |
 90%
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The molar volume of liquid benzene (density= 0.877 g ml-1) increases by a factor of 2750 as it vapourises at 20°C. At 27°C when a non-volatile solute (that does not dissociate) is dissolved in 54.6cm3 of benzene, vapour pressure of this solution, is found to be 98.88 mm Hg. calculate the freezing point of the solution.

Given: Enthalpy of vapourisation of benzene(l)=394.57 Jg-1. Enthalpy of fusion of benzene (l) = 10.06 kJ mol-1 Molal depression constant for benzene=5.0 K kg mol-1.

1. 177.65 K

2. 277.65 K

3. 517.65 K

4. 237.15 K

Subtopic:  Depression of Freezing Point |
 60%
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The depression in the freezing point of water when 10 g of CH3CH2CHClCOOH is added to 250 g of water is -Ka=1.4 X 10-3, Kf=1.86K kg mol-1

1. 0.15°C

2. 2.15°C

3. 1.15°C

4. 0.65°C

Subtopic:  Depression of Freezing Point |
 58%
From NCERT
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The ratio of the vapour pressure of a solution to the vapour pressure of the solvent is

1. Equal to the mole fraction of the solvent

2. Proportional to the mole fraction of the solute

3. Equal to the mole fraction of the solute

4. None of the above

Subtopic:  Relative Lowering of Vapour Pressure |
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Mole fraction of the component A in vapour phase is X1 and mole fraction of component A in liquid mixture is X2 then 

(PA0 = vapour pressure of pure A; PB0= vapour pressure of pure B),

then total vapour pressure of the liquid mixture is-

1. PA0X2X1

2. PA0X1X2

3. PB0X1X2

4. PB0X2X1

Subtopic:  Relative Lowering of Vapour Pressure |
 59%
From NCERT
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pH of a 0.1 (M) monobasic acid is 2. Osmotic pressure at a given temperature T is-

1. 0.1RT

2. 0.11RT

3. 1.1RT

4. 0.01RT

Subtopic:  Osmosis & Osmotic Pressure |
From NCERT
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The vapour pressure of pure water at 298K is 23.76mm. The vapour pressure of a solution of sucrose(C12H22O11) in 5.56 moles of water is 23.392mm Hg. The mass of sucrose in the solution is

1. 15 g

2. 45 g

3. 30 g

4. 37.5 g

Subtopic:  Relative Lowering of Vapour Pressure |
 58%
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Among the following options, 0.1 M aqueous solution that will have the lowest freezing point is-

1. Potassium Sulphate. 2. Sodium chloride.
3. Urea. 4. Glucose.

Subtopic:  Depression of Freezing Point |
 68%
From NCERT
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The vapour pressure of toluene is 59.1 torr at 313.75 K and 298.7 torr at 353.15 K. Calculate, the molar heat of vaporisation.

1. 37888 J mol-1

2. 27188 J mol-1

3.  12834 J mol-1

4. 571328 J mol-1

Subtopic:  Raoult's Law |
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