CBSE Class 11 Chemistry Thermodynamics MCQs

 

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


More Questions...................

 

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

Answer: adiabatic

 

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

Answer: Both

 

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

Answer: Volume

 

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