Question: Thermodynamics is not concerned about
- a) the rate at which a reaction proceeds
- b) the feasibility of a chemical reaction
- c) the extent to which a chemical reaction proceeds
- d) energy changes involved in a chemical reaction
Answer: the rate at which a reaction proceeds
Question: Which of the following statements is not true regarding the laws of thermodynamics ?
- a) It deal with energy changes of microscopic systems
- b) It does not depends on the rate at which these energy transformations are carried out.
- c) It depends on initial and final states of a system undergoing the change.
- d) It deal with energy changes of macroscopic systems
Answer: It deal with energy changes of microscopic systems
Question: A ___________in thermodynamics refers to that part of universe in which observations are made and remaining universe constitutes the ___________
- a) system, surroundings
- b) system, boundary
- c) surroundings, system
- d) system, surroundings
Answer: system, surroundings
Question: The universe refers to
- a) both system and surroundings
- b) None of these
- c) only surroundings
- d) only system
Answer: both system and surroundings
Question: Which of the following statements is correct?
- a) The presence of reactants in a closed vessel made up of copper is an example of a closed system.
- b) The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.
- c) There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
- d) The presence of reacting species in a covered beaker is an example of open system
Answer: The presence of reactants in a closed vessel made up of copper is an example of a closed system.
Question: Which of the following is closed system ?
- a) Pressure cooker
- b) Rocket engine during propulsion
- c) Tea placed in a steel kettle
- d) Jet engine
Answer: Pressure cooker
Question: An isolated system is that system in which
- a) There is no exchange of mass or energy with the surroundings
- b) There is exchange of mass with the surroundings
- c) There is exchange of mass and energy with the surroundings
- d) There is no exchange of energy with the surroundings
Answer: There is no exchange of mass or energy with the surroundings
Question: The state of a thermodynamic system is described by its measurable or macroscopic (bulk) properties. These are
- a) Pressure, volume, temperature and amount
- b) Volume, temperature and amount
- c) Pressure and temperature
- d) Pressure and volume
Answer: Pressure, volume, temperature and amount
Question: Among the following the state function(s) is (are)
(i) Internal energy
(ii) Irreversible expansion work
(iii) Reversible expansion work
(iv) Molar enthalpy
- a) (i) and (iv)
- b) (ii) and (iii)
- c) (i), (ii) and (iii)
- d) (i) only
Answer: (i) and (iv)
Question: ___________ is a quantity which represents the total energy of the system
- a) Internal energy
- b) Electrical energy
- c) Chemical energy
- d) Mechanical energy
Answer: Internal energy
Question: Which of the following factors affect the internal energy of the system ?
- a) All of the above
- b) Matter enters or leaves the system
- c) Work is done on or by the system.
- d) Heat passes into or out of the system
Answer: All of the above
Question: The system that would not allow exchange of heat between the system and surroundings through its boundary is considered as
- a) adiabatic
- b) isochoric
- c) isobaric
- d) isothermal
Question: The enthalpy change of a reaction does not depend on
- a) Different intermediate reactions
- b) Initial and final enthalpy change of a reaction
- c) Nature of reactants and products
- d) The state of reactants and products
Answer: Different intermediate reactions
Question: The q is ____ when heat is transferred from the surroundings to the system and q is ______ When heat is transferred from system to the surroundings
- a) positive , negative
- b) high, low
- c) negative , positive
- d) low, high
Answer: positive , negative
Question: Which of the following statements is incorrect?
- a) Both
- b) q is a path dependent function.
- c) H is a state function
- d) None of these
Question: The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is (1 L atm = 101.32 J)
- a) – 608 J
- b) – 304 J
- c) – 6 J
- d) + 304 J
Answer: – 608 J
Question: During isothermal expansion of an ideal gas, its
- a) enthalpy remains unaffected
- b) enthalpy reduces to zero.
- c) enthalpy decreases
- d) internal energy increases
Answer: enthalpy remains unaffected
Question: The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound
- a) may be positive or negative
- b) is never negative
- c) is always positive
- d) is always negative
Answer: may be positive or negative
Question: Among the following, the intensive properties are
(i) molar conductivity (ii) electromotive force
(iii) resistance (iv) heat capacity
- a) (ii) and (iii)
- b) (i) and (iv)
- c) (i), (ii) and (iii)
- d) (i) only
Answer: (ii) and (iii)
Question: Which is an extensive property of the system ?
- a) Volume
- b) Viscosity
- c) Temperature
- d) Refractive index