Raoult's law ideal and non-ideal solutions and vapour pressure composition - One Line Questions

1. What is the mole fraction of the solute if the relative lowering of vapour pressure is 0.2 and the solution is ideal? — 0.2
2. 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? — 80 mmHg
3. 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: — A is more volatile than B
4. 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: — A is more volatile than B
5. 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: — An ideal solution
6. For a binary solution, the vapour pressure composition curve for an ideal solution is: — A straight line
7. A solution that boils at a constant temperature and has the same composition in the liquid and vapour phases is called: — An azeotrope
8. The vapour pressure composition curve for a non-ideal solution showing positive deviation is: — A curve above the straight line
9. An example of a solution exhibiting negative deviation from Raoult's law is: — Acetone and Chloroform
10. Which property of a solution is directly proportional to the mole fraction of the solute for non-volatile solutes, according to Raoult's Law? — Relative lowering of vapour pressure
11. The vapour pressure of component A in a binary solution is given by P_A = x_A * P_A°. This implies: — Component A obeys Raoult's law
12. Raoult's law is applicable to: — Ideal solutions
13. For a solution of a non-volatile solute in a volatile solvent, the vapour pressure of the solution is: — Less than the vapour pressure of the pure solvent
14. The vapour pressure of a solution containing a non-volatile solute at a given temperature is always: — Less than the vapour pressure of the pure solvent
15. In a non-ideal solution showing negative deviation, the volume of the solution is generally: — Less than the sum of the volumes of the pure components
16. Raoult's law is a special case of: — Henry's law
17. If a solution shows positive deviation, the boiling point of the solution will be: — Lower than that of the pure components
18. 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: — Negative deviation
19. A solution that deviates from Raoult's law is called: — Non-ideal solution
20. Which of the following is a characteristic of a solution showing negative deviation from Raoult's law? — The solution has a lower vapour pressure than predicted by Raoult's law.
21. If a solution shows positive deviation from Raoult's law, then: — Intermolecular forces between solute-solvent are weaker than between like molecules
22. For a binary solution, Raoult's law states that the partial vapour pressure of each volatile component is equal to: — Its mole fraction in the solution multiplied by its vapour pressure in the pure state
23. Which of the following is a pair of liquids that does NOT form an ideal solution? — Water and Ethanol
24. 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: — Positive deviation
25. Which of the following is a non-ideal solution showing minimum boiling azeotrope? — Ethanol and water
26. A solution that obeys Raoult's law over the entire range of concentration is called: — Ideal solution
27. Which phenomenon occurs when a solution does not obey Raoult's law and forms a mixture with a constant boiling point? — Azeotrope formation
28. 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: — P_A = x_A * P_A° and P_B = x_B * P_B°
29. The vapour pressure of a pure solvent is denoted by: — P°
30. The total vapour pressure of a solution containing volatile components A and B is given by: — P_total = x_A * P_A° + x_B * P_B°
31. If the vapour pressure of a solution is lower than predicted by Raoult's law, it indicates: — Negative deviation
32. A solution where the solute-solvent interactions are stronger than solute-solute and solvent-solvent interactions exhibits: — Negative deviation from Raoult's law
33. A solution that forms a maximum boiling azeotrope will exhibit: — Negative deviation from Raoult's law
34. When two volatile liquids are mixed, the total vapour pressure will be the sum of partial vapour pressures, as per: — Dalton's law of partial pressures
35. According to Raoult's law, the relative lowering of vapour pressure of a solvent is equal to the mole fraction of the: — Solute in the solution
36. Which of the following conditions favors the formation of an ideal solution? — Similar molecular size and polarity of components
37. According to Raoult's law, for a solution of non-volatile solutes, the relative lowering of vapour pressure is equal to: — The mole fraction of the solute
38. 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: — The solution is ideal
39. Which of the following statements is incorrect regarding non-ideal solutions? — For negative deviation, ΔHmix is always positive
40. Which of the following is a characteristic of a non-ideal solution showing negative deviation? — Volume of solution is greater than the sum of volumes of pure components (ΔVmix > 0)
41. If the vapour pressure of a solution is equal to the vapour pressure of the pure solvent, then the solute must be: — Non-volatile
42. Which of the following pairs forms an ideal solution? — Benzene and Toluene
43. A solution that shows negative deviation from Raoult's law will have: — Stronger solute-solvent interactions than pure components
44. 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: — x_A * P_A° + x_B * P_B°
45. In a binary ideal solution, the sum of mole fractions of the components is always: — Equal to one
46. Which of the following is a characteristic of a solution exhibiting positive deviation from Raoult's law? — Vapour pressure is higher than predicted
47. Which of the following is a characteristic of a solution showing positive deviation from Raoult's law? — Solute-solvent interactions are weaker than pure component interactions
48. Which of the following statements is true for an ideal solution? — ΔHmix = 0, ΔVmix = 0
49. A solution shows negative deviation from Raoult's law when: — ΔHmix < 0 and ΔVmix < 0
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