Equilibrium Mock Test – Class 11 Chemistry

1. A claim says, “If a pure solid and its liquid are present together, they must always be at equilibrium.” The claim needs the condition that

2. In the equilibrium , adding from a soluble salt will initially

3. For , if the molar solubility is , the correct relation between and is

4. The basic buffer equation is most suitably written as

5. For , the solubility product expression is

6. A monoprotic strong acid of concentration is assumed to ionize completely. Its is

7. For , at . Using , is closest to

8. For , and total pressure is . The value of is closest to

9. In a reversible chemical reaction at equilibrium, the reaction mixture usually contains

10. For , at a temperature. If of is taken and the total equilibrium pressure is , the degree of dissociation is closest to

11. For the dissociation , if the initial amount of is and the degree of dissociation is , the equilibrium moles of are

12. A solution contains and . If , the before adding any strong acid or base is

13. A volatile liquid is kept in a closed container at fixed temperature. The condition most essential for maintaining its liquid-vapour equilibrium is that

14. A solution is called saturated at a given temperature when

15. The molar solubility of is . Its is

16. A physical equilibrium is most likely to be established when

17. The reaction represents a homogeneous equilibrium because

18. For a weak acid of initial concentration and degree of ionization , the equilibrium concentrations are best written as

19. A rate-time graph for the same reversible reaction is drawn twice: one curve set is without catalyst and the other is with catalyst. The catalyst case is best shown by

20. A salt of a strong acid and a strong base, such as , is approximately neutral at because

21. For , initially and . At equilibrium, . The equilibrium concentration of is

22. For , with all concentrations in , the unit of is

23. A solution contains and . Adding can precipitate , while adding can precipitate . The correct calculation choice is

24. For , a mixture is at equilibrium with . Some is removed suddenly. The system then shifts forward because

25. A reaction vessel initially contains only products for the reversible reaction , where is written as reactant and as product. The system can still reach equilibrium because

26. In a reversible reaction, a catalyst is added before equilibrium is reached. At this introductory level, the safest statement is that the catalyst

27. A student first writes and then forms . The main problem is that

28. The conjugate acid of is

29. For , if molar solubility is , the correct relation is

30. The idea “equilibrium is static because no visible change occurs” is weak because

31. A reversible reaction is written as . If the temperature is increased, the equilibrium shifts

32. The molar solubility of in water is , and . The corresponding is closest to

33. A physical equilibrium can be recognized most safely by

34. A pressure-based calculation for a gas mixture gives partial pressures before using . The step most likely to give a wrong answer is

35. A salt has . In one solution, and . The best conclusion is

36. For , at . Using , is closest to

37. At , . If of a conjugate acid is , the of its conjugate base is

38. The dissolution of increases in acidic solution because

39. A claim says, “At equilibrium, must be zero because the reaction has no net change.” The better interpretation is that

40. The relation means that the partial pressure of a gas in an equilibrium mixture is obtained by multiplying the total pressure by its

41. The statement “vapour pressure of a liquid at a fixed temperature depends mainly on the amount of liquid taken” is best repaired by saying that vapour pressure

42. A reaction list contains these equilibria:

The claim that needs correction is

43. An ICE setup for starts with of and no . If is the concentration of dissociated, the equilibrium concentrations are

44. A catalyst is added to a reversible reaction already at equilibrium. The catalyst will

45. A table gives parent acid-base strengths for four salts.

The row that needs correction is

46. A salt is formed from a weak acid and a weak base. The solution is acidic at when

47. Pressure is especially important in equilibrium discussions when the system contains

48. A table gives acid ionization constants at the same temperature.

The strongest acid in the list is

49. For , an equilibrium mixture has and . The equilibrium concentration of is

50. A conjugate acid-base pair must differ by