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