Improve your NEET Chemistry preparation with topic-wise practice questions. Strengthen concepts with our comprehensive NEET Chemistry question bank.
A mixture of two volatile liquids A and B shows a negative deviation from Raoult's law. Which of the following statements is INCORRECT regarding this mixture?
The enthalpy of mixing is negative.
The volume of mixing is negative.
The boiling point of the mixture is lower than that predicted by Raoult's law.
The intermolecular forces between A and B are stronger than the A-A and B-B interactions.
A binary solution of liquids A and B deviates positively from Raoult's law. Which of the following statements is NOT true for this solution?
The total vapour pressure of the solution is greater than the ideal vapour pressure.
The intermolecular forces between A-A and B-B are stronger than those between A-B.
The enthalpy of mixing () is positive.
The volume of mixing () is positive.
At a given temperature, the vapour pressure of pure liquid A is 300 mmHg and that of pure liquid B is 500 mmHg. A solution of A and B shows a total vapour pressure of 400 mmHg. Assuming ideal behavior, what is the mole fraction of A in the liquid phase?
0.2
0.5
0.8
1.0
A solution containing a non-volatile solute exhibits a lower vapor pressure than the pure solvent. This phenomenon can be BEST explained by:
The solute particles increase the intermolecular forces between solvent molecules.
The solute particles decrease the kinetic energy of the solvent molecules.
The solute particles occupy some surface area, reducing the solvent's ability to evaporate.
The solute particles react with the solvent molecules, reducing the amount of solvent available.
Which one of the following is TRUE for a solution showing negative deviation from Raoult's law?
A-B interactions are weaker than A-A and B-B interactions
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.
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
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.
