Raoult's law ideal and non-ideal solutions and vapour pressure composition - Question Bank
1. The total vapour pressure of a binary solution of volatile components A and B can be expressed as P_total = x_A * P_A° + (1-x_A) * P_B° only if:
2. Which of the following is a pair of liquids that does NOT form an ideal solution?
3. If the vapour pressure of a solution is equal to the vapour pressure of the pure solvent, then the solute must be:
4. Raoult's law is applicable to:
5. In a non-ideal solution showing negative deviation, the volume of the solution is generally:
6. For a binary solution of volatile components A and B, if the vapour pressure composition curve lies above the straight line connecting P_A° and P_B°, it indicates:
7. A solution that forms a maximum boiling azeotrope will exhibit:
8. Which of the following is a characteristic of a solution showing positive deviation from Raoult's law?
9. According to Raoult's law, the relative lowering of vapour pressure of a solvent is equal to the mole fraction of the:
10. If P_A° > P_B°, and in the vapour phase, the mole fraction of A (y_A) is greater than its mole fraction in the liquid phase (x_A), then:
11. The vapour pressure of a mixture of two volatile liquids A and B is represented by a curve that lies below the straight line connecting P_A° and P_B°. This indicates:
12. Which of the following is a characteristic of a solution showing negative deviation from Raoult's law?
13. The vapour pressure of component A in a binary solution is given by P_A = x_A * P_A°. This implies:
14. If a solution shows positive deviation, the boiling point of the solution will be:
15. A solution that boils at a constant temperature and has the same composition in the liquid and vapour phases is called:
16. The vapour pressure of a mixture of two volatile liquids A and B is given by P_total = x_A * P_A° + x_B * P_B°, where x_A and x_B are mole fractions in the liquid phase. This represents:
17. Which of the following statements is incorrect regarding non-ideal solutions?
18. What is the mole fraction of the solute if the relative lowering of vapour pressure is 0.2 and the solution is ideal?
19. If the mole fraction of solvent in a solution is 0.8 and the vapour pressure of the pure solvent is 100 mmHg, what is the vapour pressure of the solution assuming it behaves ideally and the solute is non-volatile?
20. An example of a solution exhibiting negative deviation from Raoult's law is:
21. When two volatile liquids are mixed, the total vapour pressure will be the sum of partial vapour pressures, as per:
22. A solution that shows negative deviation from Raoult's law will have:
23. The vapour pressure of a solution containing a non-volatile solute at a given temperature is always:
24. Which of the following is a characteristic of a solution exhibiting positive deviation from Raoult's law?
25. For a binary solution, the vapour pressure composition curve for an ideal solution is:
26. Raoult's law is a special case of:
27. In a mixture of two volatile liquids A and B, if the mole fraction of A in the vapour phase is higher than its mole fraction in the liquid phase, it indicates:
28. Which of the following is a non-ideal solution showing minimum boiling azeotrope?
29. The vapour pressure of a pure solvent is denoted by:
30. A solution shows negative deviation from Raoult's law when:
31. Which of the following conditions favors the formation of an ideal solution?
32. If P_total is the total vapour pressure of a solution of volatile components A and B, and x_A, x_B are their mole fractions in the liquid phase, then according to Dalton's law of partial pressures and Raoult's law, P_total is:
33. For a solution of a non-volatile solute in a volatile solvent, the vapour pressure of the solution is:
34. Which phenomenon occurs when a solution does not obey Raoult's law and forms a mixture with a constant boiling point?
35. The vapour pressure composition curve for a non-ideal solution showing positive deviation is:
36. A solution where the solute-solvent interactions are stronger than solute-solute and solvent-solvent interactions exhibits:
37. Which of the following pairs forms an ideal solution?
38. In a binary ideal solution, the sum of mole fractions of the components is always:
39. If the vapour pressure of a solution is lower than predicted by Raoult's law, it indicates:
40. A solution that deviates from Raoult's law is called:
41. The total vapour pressure of a solution containing volatile components A and B is given by:
42. Which of the following is a characteristic of a non-ideal solution showing negative deviation?
43. For a binary solution of components A and B, if P_A and P_B are partial vapour pressures and x_A and x_B are mole fractions, Raoult's law can be expressed as:
44. If a solution shows positive deviation from Raoult's law, then:
45. Which property of a solution is directly proportional to the mole fraction of the solute for non-volatile solutes, according to Raoult's Law?
46. A solution that obeys Raoult's law over the entire range of concentration is called:
47. For a binary solution, Raoult's law states that the partial vapour pressure of each volatile component is equal to:
48. Which of the following statements is true for an ideal solution?
49. According to Raoult's law, for a solution of non-volatile solutes, the relative lowering of vapour pressure is equal to: