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
Which of the following 0.1 M aqueous solutions will have the lowest freezing point?
1. | Potassium Sulphate. | 2. | Sodium chloride. |
3. | Urea. | 4. | Glucose. |
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
The vapour pressure of a pure liquid solvent A is 0.80 atm. When a non-volatile substance B is added to the solvent, its vapour pressure drops to 0.60 atm.
Mole fraction of the component B in the solution is:
1. | 0.50 | 2. | 0.75 |
3. | 0.40 | 4. | 0.25 |
The lowest boiling point, if concentration is fixed at 0.1 M in aqueous solution, is given by which of the following solutions?
a. K2SO4
b. NaCl
c. Urea
d. Glucose
1. a, b
2. b, c
3. c, d
4. d, a
The boiling point of acetic acid is 118.1 and its latent heat of vaporisation is 121 cal/gm. A solution containing 0.4344 gm anthracene in 44.16 gm acetic acid boils at 118.24. What is the molecular wt. of anthracene ?
1. 122
2. 178
3. 105
4. 154
Which solution will have the highest boiling point ?
1. 1 (M) C6H12O6 solution
2. 1 (M) NaCl solution
3. 1 (M) BaCl2 solution
4. 1 (M) CO(NH2)2 solution
A 2.0% solution by weight of urea in water shows a boiling point elevation of 0.18 deg [Molecular weight of urea=60]. Calculate the latent heat of vaporization per gram of water.
1. 495.3 cal/g
2. 560.3 cal/g
3. 525.8 cal/g
4. 501.3 cal/g
A solution of 18 g of glucose in 1000 g of water is cooled to -0.2 oC. The amount of ice separating out from this solution is -
[Kf(H2O) = 1.86 K molal-1]
1. | 70 g | 2. | 140 g |
3. | 90 g | 4. | 210 g |
The partial pressure of ethane over a saturated solution containing 6.56 X 10-2 g of ethane is 1 bar. If the solution contains 5.00 X 10-2 g of ethane, then what shall be the partial pressure of the gas?
1. 0.76 bar
2. 0.16 bar
3. 1.16 bar
4. 3.12 bar