Multiple Choice QuestionsWhich of the following is not a colligative property?
Elevation in boiling point
Depression in freezing point
Osmotic pressure
Lowering of vapour pressure
3 g of urea is dissolved in 45 g of H2O. The relative lowering in vapour pressure is
0.05
0.04
0.02
0.01
Which of the following aqueous solution will exhibit highest boiling point?
0.01M urea
0.01 M KNO3
0.01M Na2SO4
0.015M C6H12O6
Which of the following is not a colligative property?
Osmotic pressure
Optical activity
Depression in freezing point
Elevation in boiling point
Which of the following aqueous solution has the highest freezing point?
0.1M surcose
0.01 M NaCl
0.1 M NaCl
0.01 M Na2SO4
Osmotic pressure of the solution can be increased by,
increasing the temperature of the solution
decreasing the temperature of the solution
increasing the volume of the vessel
diluting the solution
After adding non-volatile solute freezing point of water decreases to -0.186C. Calculate ΔTb if Kf = 1.86 K kg mol-1 and Kb =0.521 K kg mol-1.
0.521
0.0521
1.86
0.0186
B.
0.0521
According to Raoult's law, when a non-volatile solid is added to the solvent its vapour pressure decreases and now its vapour pressure would become equal to that of solid solvent at lower temperature. Thus, the freezing point of the solvent decreases.
ΔTf ∝ m (m = molality of solution)
ΔTf = Kf m, 0.186 = 1.86 × m
m= 0.1
Now ΔTb = Kb × m = 0.521 × 0.1 = 0.0521
Which of the following has the lowest freezing point?
0.1 m sucrose
0.1 m urea
0.1 m ethanol
0.1 m glucose
A litre of solution is saturated with AgCl. To this solution if 1.0 × 10-4 mole of solid NaCl is added, what will be the [Ag+], assuming no volume change ?
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