Vapour pressure of solutions, Raoult's law, ideal and non-ideal solutions, colligative properties and determination of molecular mass, van't Hoff factor - Question Bank
1. A solution of glucose in water and a solution of sucrose in water, both having the same molar concentration, will have the same:
2. The depression in freezing point of a solvent upon addition of a solute is a colligative property because it depends on:
3. Which of the following statements about Raoult's law is INCORRECT?
4. If the degree of dissociation of an electrolyte is 1 (complete dissociation), the van't Hoff factor 'i' is equal to:
5. A solution that boils at a temperature higher than the boiling point of the pure solvent is said to exhibit:
6. The vapour pressure of a solution is always lower than that of the pure solvent at the same temperature due to:
7. When a non-volatile solute is dissolved in a solvent, the vapour pressure of the solvent:
8. Which colligative property is generally preferred for determining the molecular mass of macromolecules?
9. Osmotic pressure is particularly useful for determining the molecular mass of:
10. In the formula for determining molecular mass from freezing point depression (M = (K_f * w) / (ΔT_f * W)), 'w' represents:
11. To determine the molecular mass of a non-volatile solute using the elevation of boiling point method, the formula is:
12. The determination of molecular mass of a solute using colligative properties relies on the fact that colligative properties are:
13. The van't Hoff factor can be used to modify the colligative property expressions. For example, elevation of boiling point becomes:
14. For a solution of acetic acid in water, which undergoes partial dissociation, the van't Hoff factor (i) is typically:
15. For NaCl, which dissociates into Na⁺ and Cl⁻ ions, the theoretical van't Hoff factor is:
16. If a solute associates to form 'n' particles in solution, and the degree of association is α, the van't Hoff factor 'i' is given by:
17. If a solute dissociates into 'n' ions in solution, and the degree of dissociation is α, the van't Hoff factor 'i' is given by:
18. For a non-electrolyte solute that does not dissociate or associate in solution, the van't Hoff factor (i) is:
19. The van't Hoff factor (i) is used to account for the:
20. Reverse osmosis is a process where:
21. Isotonic solutions are solutions that have:
22. What is the relationship between osmotic pressure (Π), molar concentration (C), gas constant (R), and absolute temperature (T)?
23. Osmotic pressure (Π) of a solution is given by the formula:
24. The unit of cryoscopic constant (K_f) is:
25. Depression of freezing point (ΔT_f) is directly proportional to the molality (m) of the solution. The proportionality constant is known as:
26. The unit of ebullioscopic constant (K_b) is:
27. Elevation of boiling point (ΔT_b) is directly proportional to the molality (m) of the solution. The proportionality constant is known as:
28. For a dilute solution, the relative lowering of vapour pressure is given by:
29. The relative lowering of vapour pressure of a solvent is equal to the mole fraction of the:
30. Which of the following is NOT a colligative property?
31. Colligative properties depend on:
32. Maximum boiling azeotropes are formed by solutions showing:
33. Minimum boiling azeotropes are formed by solutions showing:
34. Azeotropes are solutions that:
35. Which of the following pairs forms a non-ideal solution with negative deviation?
36. For a non-ideal solution showing negative deviation, the enthalpy of mixing (ΔH_mix) is typically:
37. Non-ideal solutions that show negative deviation from Raoult's law exhibit:
38. Which of the following pairs forms a non-ideal solution with positive deviation?
39. For a non-ideal solution showing positive deviation, the intermolecular forces between solvent-solvent and solute-solute are generally: than solvent-solute interactions.
40. Non-ideal solutions that show positive deviation from Raoult's law exhibit:
41. A non-ideal solution is one that:
42. Which of the following is a characteristic of an ideal solution?
43. An ideal solution is one that:
44. What is the total vapour pressure of an ideal solution according to Raoult's law?
45. For a binary solution of two volatile components A and B, Raoult's law can be expressed as:
46. According to Raoult's law, the partial vapour pressure of a volatile component in a solution is directly proportional to its:
47. How does the vapour pressure of a pure solvent change with increasing temperature?
48. What is the definition of vapour pressure of a liquid?