Solutions Mock Test – Class 12 Chemistry

1. A diver returns rapidly from deep water to the surface. Painful bubbles may form in body fluids mainly because:

2. A homogeneous mixture contains nitrogen, oxygen, argon, and carbon dioxide. Based on component count, it is best described as:

3. A liquid component is called volatile in a solution context when it:

4. A table for molar-mass determination from boiling point elevation is given below.

The row that needs correction is:

5. A negative-deviation solution often has a higher boiling point than the ideal expectation because:

6. Hydrogen absorbed in palladium is commonly classified as:

7. A non-volatile solute is dissolved in a volatile solvent. The solution has a lower vapour pressure than the pure solvent and exerts osmotic pressure across a semipermeable membrane. These observations are similar because both:

8. A liquid mixture obeys Raoult's law over the composition range considered. For component , reducing from to at the same temperature will:

9. A gas has partial pressure over a liquid at a fixed temperature. If , the mole fraction of the gas in the solution is:

10. The comparison that reverses the usual distinction between ideal and non-ideal solutions is:

11. The missing conversion in the statement “ ______ ” is:

12. A liquid pair releases heat on mixing and the final volume is smaller than the sum of the separate volumes. The vapour-pressure behaviour is most likely:

13. Assertion: Association of solute particles can give a higher apparent molar mass.
Reason: Association decreases the number of independent solute particles in solution.

14. Osmosis is the movement of:

15. Assertion: Molality is temperature independent in ordinary solution calculations.
Reason: Molality uses mass of solvent, and mass is not affected by ordinary temperature changes.

16. For a very dilute aqueous solution, by mass most nearly represents:

17. A table gives four situations.

The row that needs correction is:

18. If , the total vapour pressure of an ideal binary volatile solution can be written as:

19. When a liquid pair absorbs heat on mixing and its final volume exceeds the sum of the separate volumes, the vapour pressure is likely to show:

20. A bottle label says ethanol in water. This means:

21. A data table for aqueous solutions at the same temperature is shown below.

The decreasing order of osmotic pressure is:

22. Negative deviation from Raoult's law is expected when:

23. A weak electrolyte gives and dissociates as . Its degree of dissociation is:

24. An ideal solution has , , and contains a non-volatile solute. The solute mole fraction is:

25. A solute is described as non-volatile in a solvent. In vapour-pressure discussion, this means the solute:

26. Mole fraction of component in a solution is defined as:

27. A learner must decide between Raoult's law and Henry's law. The data given are gas pressure above a solution and mole fraction of the gas dissolved in a liquid. The correct choice is:

28. To prepare a solution using of solvent, the required amount of solute is:

29. Two liquid preparations are described below.
Case 1: solute is made up to solution.
Case 2: solute is mixed with solvent, and volumes are assumed additive.
Under the stated assumption, the volume percentages in Case 1 and Case 2 are respectively:

30. At the same temperature, a solution with higher osmotic pressure than another is called:

31. A supersaturated solution is best described as a solution that:

32. A table about non-volatile solute and vapour pressure is shown below.

The row that needs correction is:

33. The situation-relation pairing that is mismatched is:

34. A table summarizes possible observations for a non-volatile solute in a volatile solvent.

The row that needs correction is:

35. Assuming Raoult's law applies, a pure solvent has vapour pressure . After adding a non-volatile solute, the solute mole fraction is . The lowering of vapour pressure is:

36. A sealed carbonated drink contains dissolved under high pressure. When the bottle is opened, bubbles appear mainly because:

37. In a molality calculation, of solute is dissolved in of water. The mass that belongs in the denominator is:

38. The osmotic pressure equation modified for association or dissociation is:

39. Assuming Raoult's law applies, a pure solvent has vapour pressure at a given temperature. A non-volatile solute is added so that for the solvent. The vapour pressure of the solvent over the solution is:

40. An azeotrope is a liquid mixture that:

41. Antifreeze added to water in a radiator helps mainly because it:

42. A hot saturated solution of is cooled carefully without disturbance and remains clear, even though its concentration is higher than the normal solubility at the lower temperature. The solution is:

43. The terms dilute and concentrated mainly compare:

44. The mass percentage of a solute is defined using:

45. Measured values are , , and . The van't Hoff factor is:

46. Use the descriptions below. Vessel P contains sugar dissolved completely in water, Vessel Q contains oil and water in two visible layers, Vessel R contains uniformly mixed air, and Vessel S contains muddy water that settles on standing. The pair that represents homogeneous solutions is:

47. Consider the following statements.
Statement I: is calculated as .
Statement II: is calculated as .
Statement III: Both and are proportional to molality for dilute solutions.

48. A mixture contains dissolved in water under pressure. For the usual description of this solution, the solute and solvent are respectively:

49. A solvent mass is recorded as . The same mass in grams is:

50. Freezing-point data for a dimerizing solute give an observed molar mass of . If its normal molar mass is , the degree of association is: