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Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 9 (60 MCQs)

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1. Specific heat of water is 4.18 J g$^{-1 }$$^\circ$C$^{-1}$. Specific heat of wood is 1.760 J g$^{-1 }$$^\circ$C$^{-1}$ What material needs more heat energy to raise the temperature?
2. Hess's law is also known as
3. ..... is intensive variable
4. What does entropy primarily measure in a system?
5. A heat engine absorbs heat Q$_{1}$ at temperature T$_{1}$ and heat Q$_{2}$ at temperature T$_{2}$. The work done by the engine is J (Q$_{1}$ + Q$_{2}$). This data
6. A concept that addresses entropy
7. When work is done on system or by a system there is a change in .....
8. 1 mole of helium gas is heated from a temperature of 300 K to 600 K. Calculate the entropy change if a) Volume is kept constantb) Pressure is kept constant
9. Heat transferred by electromagnetic waves is:
10. States that energy spontaneously spreads from higher concentrations to regions of lower concentrations.
11. When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?
12. One mole of which of the following has the highest entropy?
13. What quantity of heat is required to raise the temperature of 450 grams of water from 15$^\circ$C to 85$^\circ$C? The specific heat capacity of water is 4.18 J/g/$^\circ$C.
14. Approximate values of the average bond enthalpies, in kJ/mol, of three substances are:H-H = 430, F-F = 155, H-F = 565What is the enthalpy change in kJ for this reaction:2HF $\rightarrow$ H$_{2}$ + F$_{2}$
15. Kelvin plank law deal about .....
16. Which thermodynamic function accounts automatically for enthalpy and entropy both?
17. Two objects at different temperatures are in contact. Which of the following happens to their thermal energy?
18. The processes or systems that do not involve heat are called
19. If a system takes heat of 100 J and 100 J work is done on the system . The change in internal energy is
20. Which is the incorrect statement about Carnot cycle?
21. An electrical heater supplies heat to a system at a rate of 100W. The system performs work at a rate of 75 joule per second. At what rate is the internal energy increasing?
22. When work is dissipated into internal energy, what is the change in the disorderly motion of molecules.
23. An isobaric process is one in which:
24. What does an endergonic reaction do with energy?
25. Which statement is true about the ENTROPY?
26. In a Carnot engine, which of the following is true about the efficiency of the engine?
27. It is the degree of hotness or coldness of a substance or body
28. As temperature rises .....
29. Which of the following is not a state function?
30. The physics of the refrigerator closely resembles the
31. What remains constant in an isothermal process?
32. In adiabatic process heat change is
33. The entropy in the universe
34. At absolute zero entropy of a system tends to
35. Which scenario exemplifies the second law of thermodynamics?
36. Identify the incorrect statement among the following.-A:Entropy is a measure of disorder or randomness in a system, increasing in irreversible processes.-B:The entropy of an isolated system remains constant if the processes are reversible.-C:Consider cooling a closed system, total entropy change can be negative because energy is removed from the system.
37. All phase changes (changing states) requires energy to be added or taken away.
38. A measure of the total kinetic energy of the molecules in a substance
39. When ammonium nitrate dissolves in water, the solution gets cold. Which is true?
40. The variable of WORK is
41. Properties whose values depend on the size/extent-of the system are:
42. The entropy for irreversible process is always
43. For exothermic reaction $\Delta$
44. Rapidly inflating of balloon under a pumping machine.
45. What happens to the entropy of a system when a gas expands into a vacuum?
46. During an exothermic reaction, heat content in the surroundings increases because
47. In optical pyrometer, the temperature of the body can be calculated by using the formula
48. The heating and expanding of a gas is called
49. What are the four laws of thermodynamics?
50. C+ O$_{2}$ $\rightarrow$ CO$_{2}$ + 60kJ, what is the value for $\Delta$H for the reaction?
51. The universal gas constant is:
52. Which of the following is equivalent to the principle of energy conservation?
53. Which of the following property cannot be used to describe state of a system?
54. The rate og change of free energy with pressure at constant temperature is equal to
55. Energy can be less than zero
56. Given the change of phase:CO$_{2}$(g) $\rightarrow$ CO$_{2}$(s). As CO$_{2}$(g) changes to CO$_{2}$(s), the entropy of the system
57. Which of the following would most likely lead to a spontaneous reaction.
58. In a closed system, 500 J of heat is added, and the system does 200 J of work. According to the first law of thermodynamics, what is the change in internal energy of the system?
59. What determines whether a process is reversible?
60. Identify the incorrect statement among the following.-A:In an isothermal process, the temperature of the system remains constant.-B:During such a process, the internal energy of an ideal gas does not change.-C:An isothermal expansion of a gas requires a change in external temperature to maintain constant temperature within the system.
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