Chemistry Class-11: Chapter – 6. Thermodynamics Part – 1 (For CBSE, ICSE, IAS, NET, NRA 2023)

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I. Multiple Choice Questions (Type-I)

Question: 1

Thermodynamics is not concerned about________.

(i) Energy changes involved in a chemical reaction.

(ii) The extent to which a chemical reaction proceeds.

(iii) The rate at which a reaction proceeds.

(iv) The feasibility of a chemical reaction.

Answer: (iii)

Question: 2

Which of the following statements is correct?

(i) The presence of reacting species in a covered beaker is an example of open system.

(ii) There is an exchange of energy as well as matter between the system and the surroundings in a closed system.

(iii) The presence of reactants in a closed vessel made up of copper is an example of a closed system.

(iv) The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.

Answer: (iii)

Question: 3

The state of a gas can be described by quoting the relationship between________.

(i) Pressure, volume, temperature

(ii) Temperature, amount, pressure

(iii) Amount, volume, temperature

(iv) Pressure, volume, temperature, amount

Answer: (iv)

Question: 4

The volume of gas is reduced to half from its original volume. The specific heat will be ________.

(i) Reduce to half

(ii) Be doubled

(iii) Remain constant

(iv) Increase four times

Answer: (iii)

Question: 5

During complete combustion of one mole of butane, of heat is released. The thermochemical reaction for above change is





Answer: (iii)

Question: 6

of formation of at certain temperature is . The value of




(iv) Equal to

Answer: (ii)

Question: 7

In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.





Answer: (iii)

Justification: free expansion

Adiabatic process

, this means that internal energy remains constant. Therefore, .

In ideal gas there is no intermolecular attraction. Hence when such a gas expands under adiabatic conditions into a vacuum no heat is absorbed or evolved since no external work is done to separate the molecules.