Chemistry Class-11: Chapter –6. Thermodynamics Part – 1

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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

(i)

(ii)

(iii)

(iv)

Answer: (iii)

Question: 6

of formation of at certain temperature is . The value of

(i)

(ii)

(iii)

(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.

(i)

(ii)

(iii)

(iv)

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.

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