Thermodynamics Mock Test – Class 11 Chemistry

1. A process is reported as , but . The work term must be

2. A student writes, “The reaction mixture has , so the reaction mixture absorbed heat.” The better correction is

3. A reaction has and . At , the reaction mixture has . Use and . The actual is closest to

4. A ideal gas sample is heated by . If and , the constant-pressure heat absorbed is closest to

5. The reason enthalpy is a state function is that

6. A gas expands from to . A note lists and during an irreversible constant-pressure expansion. The pressure that must be used in is

7. One mole of an ideal gas expands reversibly and isothermally at from to . Use and . The work is closest to

8. The universe in a thermodynamic description is represented as

9. A learner says, “Enthalpy is exactly the heat present inside a substance.” The most accurate correction is that

10. The pair in which both quantities are forms of energy transfer in thermodynamics is

11. For a process with and , the process is favoured mainly at

12. A piece of ice melts slowly in a beaker at room temperature. The thermodynamic aspect of this observation is mainly connected with

13. An ionic solid has lattice dissociation enthalpy . The hydration enthalpy of is , and the enthalpy of solution is . The hydration enthalpy of is

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

15. 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

16. A gaseous reaction has , , and at . Use . The standard Gibbs energy change is closest to

17. The same exothermic reaction has . The entropy increase of the surroundings is larger at than at because

18. Standard enthalpy change is usually reported for substances in their standard states at a pressure of

19. A hydrocarbon is burned in a bomb calorimeter. The calorimeter heat capacity is , the temperature rise is , and of the hydrocarbon is burned. For the combustion reaction, at . Use . The molar enthalpy of combustion is closest to

20. In a coffee-cup calorimeter, a reaction causes of solution to warm from to . Take , and neglect the heat capacity of the cup. The heat change of the reacting system is

21. The first law of thermodynamics for a closed system in chemistry is commonly written as

22. 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

23. Consider the statements about macroscopic properties of a thermodynamic system.
I. They help describe the state of a system.
II. They are measurable at the bulk level.
III. They are always independent of the amount of substance.
The valid statements are

24. A solid with absorbs of heat. Its temperature rise is

25. For a gaseous reaction at , , , and . Use . The approximate is

26. A neutralization reaction is carried out in a coffee-cup calorimeter. of acid and of base are mixed, and of water is formed. The total solution mass is , , and the temperature rises by . Neglecting the cup heat capacity, the enthalpy of neutralization per mole of water formed is

27. A gas is enclosed in a cylinder fitted with a frictionless movable piston. The piston prevents gas from escaping, but it can move when the gas expands or contracts. The gas is best described as

28. A process is described as adiabatic. The statement that must be true for the system is

29. A reversible isothermal compression takes an ideal gas from to , where . The sign of and is

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

31. For a reaction at , the values are and . The standard Gibbs energy change is

32. A gas sample is enclosed by a movable piston made of a heat-conducting material. The piston fits tightly, so no gas escapes. The boundary permits

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

34. Study the table and choose the row that misinterprets the - work graph.

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

36. A gas in a sealed vessel is heated, and its temperature rises. At the molecular level, this most directly suggests a change in

37. For a substance under compatible conditions, the enthalpy of sublimation is often related to fusion and vaporization by

38. Hess law is based on the fact that

39. A gas expands slowly in a cylinder while its temperature is maintained at by contact with a heat reservoir. The process is

40. The unit belongs most directly to

41. A gas expands from to in two ways.
Case 1: against external pressure.
Case 2: into vacuum.
Use . The work values for Case 1 and Case 2 are

42. Standard Gibbs energy change refers to the Gibbs energy change when

43. A graph is drawn with on the vertical axis and on the horizontal axis for a reaction where and are treated as constant. The graph has a positive vertical intercept and a negative slope. The signs of and are

44. At equilibrium, the reaction quotient becomes equal to

45. The expression is equivalent to the natural logarithm form because

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

47. The common logarithm form of the standard Gibbs energy relation is

48. When two different gases mix spontaneously at the same temperature, the entropy of the gas system usually increases because

49. Use the graph description below.

The reaction represented by the graph is

50. Study the following statements about , , and .
I. corresponds to .
II. when .
III. for every reaction at equilibrium.
The valid statements are