Thermodynamics Mock Test – Class 11 Chemistry

1. A reaction has . A mixture has . The forward reaction is

2. A heat interaction is recorded as for a system. This notation means that

3. A gas in a rigid vessel absorbs of heat. Assuming only pressure-volume work is considered, the change in internal energy is

4. The relation for specific heat capacity is

5. A process is non-spontaneous in the forward direction under given conditions. The reverse process under the same conditions is spontaneous if

6. A reaction at has , , and . Use and . The actual Gibbs energy change is closest to

7. A reaction has as written. For the same reaction written with all coefficients tripled, becomes

8. A boundary that prevents transfer of matter but permits heat transfer is most consistent with a

9. For an ideal gas, a sample is heated from to . Given and , the difference between heat absorbed at constant pressure and at constant volume is

10. A learner says, “Because has the unit , it must be a state function just like .” The reasoning fails because

11. For , at . If the current reaction quotient is , use and . The actual is closest to

12. A hot metal piece is placed in cooler water inside an insulated cup. If the metal is chosen as one part and water as the other, the heat relation is best written as

13. Mechanical equilibrium in a gas-piston arrangement is most directly connected with

14. Standard enthalpy of combustion is the enthalpy change when

15. A complete thermodynamic feasibility statement for a reaction at constant temperature and pressure should include the idea that

16. A reaction has , , and . At , the actual is

17. A process has , but it appears very slow at room temperature. The best conclusion is that

18. Two objects are at and . They are brought into thermal contact, and the cooler object is chosen as the system. The sign of heat for the cooler object during the initial contact is

19. In free expansion of a gas into vacuum, the external pressure opposing expansion is

20. A reaction occurs in an open beaker at constant atmospheric pressure, and the system absorbs of heat. If only pressure-volume work is considered, the enthalpy change is

21. Assertion: In a cyclic process, if the system returns to the same thermodynamic state.
Reason: Enthalpy is a state function.

22. The enthalpy of fusion of a substance is , and its melting point is . The entropy of fusion is

23. Read the case below and identify the correct system classification.

24. A reaction carried out in an insulated calorimeter causes the solution and calorimeter together to gain of heat. For the reacting system, the heat change is

25. Bond enthalpy is most directly associated with

26. The unit most suitable for molar entropy is

27. A reaction has and . The equilibrium constant is expected to increase with temperature because

28. In a Born-Haber cycle for , the step is

29. Two moles of an ideal gas are compressed reversibly and isothermally at from to . Use and . The work is closest to

30. Two descriptions are given for the same beaker containing a dissolving salt.
I. The system is only the salt crystals before they dissolve.
II. The system is the entire salt-water mixture during dissolving.
How does the surroundings description change?

31. Read the situation and answer the question.

For the gas system, the sign sequence of work in Step 1 and Step 2 is

32. A straight-line plot of against cuts the axis at . The reaction has . The value of is

33. At , a reaction has . Use . The equilibrium constant is closest to

34. For a reaction at , and . Use . The value of is closest to

35. The relation between enthalpy change and internal energy change for a general process is

36. A graph description says that the vertical axis represents heat for a system, with values above the horizontal axis positive and values below it negative. A point plotted below the horizontal axis represents

37. A reversible isothermal expansion of ideal gas at is carried out from to . The same gas is then cooled at constant volume from to . Given , , and , the total for the two steps is closest to

38. The table gives four processes for a system. The process that must have is

39. A wall is described as permeable and diathermic. This means the wall allows

40. In using , is given in , while . The safest step before adding terms is to

41. A container has a boundary that allows heat to pass through but does not allow the gas inside to escape. This description most strongly supports

42. A reaction has at its current composition but . The equilibrium constant at that temperature must be

43. A gas is compressed from to against a constant external pressure of . Use . The value of is

44. A gas expands from to against a constant external pressure of . Use . The graph area method gives the work as

45. A process P has . It is coupled with hydrolysis of one mole of a compound having . If the process P must occur twice in the overall scheme, the minimum number of hydrolysis steps needed to make the total is

46. Use the arrangement described below.

For the gas as system, the most suitable interpretation is

47. The classification that is most consistent with thermodynamic usage is

48. Use bond enthalpies , , and . For , the approximate is

49. At , a reaction has . Use and . The value of is closest to

50. The second law rules out a cyclic heat engine whose only effect is to