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NEET Questions / Chemistry / Solutions / Henry'S Law, Raoult'S Law
A binary solution of two volatile liquids A and B deviates negatively from Raoult's Law. At a specific composition, the total vapor pressure is minimum. Which of the following statements is FALSE regarding this specific composition?
The vapor and liquid phases have identical compositions.
The boiling point is higher than that of either pure A or pure B.
The system deviates negatively from Raoult's Law.
The mole fraction of A in the vapor is always greater than that of B.
At , the partial pressure of ethane over a saturated solution containing of ethane is 1 bar. If the solution contains of ethane, then what will be the partial pressure of the gas?
2.0 bar
0.762 bar
1.5 bar
0.5 bar
A solution containing a non-volatile solute exhibits a vapor pressure lowering of 20 mm Hg compared to the pure solvent. If the mole fraction of the solute is 0.2, what is the vapor pressure of the pure solvent in mm Hg?
80 mm Hg
100 mm Hg
120 mm Hg
20 mm Hg
Two liquids A and B form an ideal solution. At a certain temperature, the vapor pressure of pure A is 400 mm Hg and that of pure B is 700 mm Hg. If the mole fraction of A in the liquid phase is 0.4, what is the mole fraction of A in the vapor phase?
0.276
0.571
0.724
0.420
The Henry's law constant for in water at is atm. If the partial pressure of in air is 0.2 atm, calculate the concentration (in molarity) of dissolved oxygen in water in equilibrium with air at . Assume the density of the solution is approximately equal to that of water (1 g/mL).
2.7 x 10⁻⁴ M
8.68 x 10⁻³ M
4.34 x 10⁻⁴ M
1.3 x 10⁻³ M
Which statement BEST describes the relationship between Raoult's and Henry's Laws?
Henry's Law is applicable for all solutions, while Raoult's Law is only for ideal solutions.
Raoult's Law is a special case of Henry's Law where the Henry's law constant equals the vapor pressure of the pure component.
Henry's Law describes the behavior of the solute in a dilute solution, while Raoult's Law describes the behavior of the solvent.
Both laws are only applicable to solutions of non-volatile solutes.
A solution of glucose (C6H12O6) is prepared by dissolving 18g of glucose in 90g of water at 300K. If the vapour pressure of pure water at 300K is 31.82 mm Hg, what is the vapour pressure of the solution?
31.19 mm Hg
31.82 mm Hg
30.55 mm Hg
32.45 mm Hg
Henry's law constant for CO2 in water at 298 K is Pa. Calculate the mass of CO2 that can be dissolved in 500 mL of water at 298 K and a CO2 partial pressure of 2.5 atm.
0.92 g
1.85 g
3.70 g
0.46 g
Which of the following is NOT an application of Henry's law?
Solubility of gases in liquids
Scuba diving and bends
Freezing point depression
Aerated drinks
