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Q. No.The following reactions were carried out in an open vessel. The reaction for which \(\mathrm{\Delta H= \Delta U}\) will be:
1. \(\mathrm{PCl}_5(\mathrm{~g}) \rightarrow \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})\)
2. \(2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_2(\mathrm{~g})\)
3. \(\text 3\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) \rightarrow 2 \mathrm{NH}_3(\mathrm{~g})\)
4. \(\mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g}) \rightarrow 2 \mathrm{HI}(\mathrm{g})\)
Subtopic: Enthalpy & Internal energy |
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Level 1: 80%+
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Match List-I with List-II:
Choose the correct answer from the options given below:
1. (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
2. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
3. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
4. (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
| List-I | List-II | ||
| (A) | Spontaneous process | (I) | \(\mathrm{\Delta H<0}\) |
| (B) | Process with \(\mathrm{\Delta P=0,} \mathrm{\Delta T=0}\) | (II) | \(\mathrm{\Delta G_{T,P}<0}\) |
| (C) | \(\mathrm{\Delta H_{reaction}}\) | (III) | Isothermal and Isobaric processes |
| (D) | Exothermic Process | (IV) | [Bond energies of molecules in reactants] – [Bond energies of product molecules ] |
Choose the correct answer from the options given below:
1. (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
2. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
3. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
4. (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
Subtopic: Thermodynamics' Properties and process |
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What is the amount of heat absorbed in the expansion of an ideal gas from \(\mathrm{4.0 ~L}\) to \(\mathrm{20~ L}\) when the gas is allowed to expand isothermally into a vacuum:
1. 20 \(\mathrm{L}\) atm
2. 0 \(\mathrm{L}\) atm
3. 40 \(\mathrm{L}\) atm
4. 24 \(\mathrm{L}\) atm
1. 20 \(\mathrm{L}\) atm
2. 0 \(\mathrm{L}\) atm
3. 40 \(\mathrm{L}\) atm
4. 24 \(\mathrm{L}\) atm
Subtopic: First Law of Thermodynamics |
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What is the enthalpy change (ΔH) for the following reaction?
\(\mathrm {H}_2 \mathrm{C} = \mathrm {CH}_2 \text {(g)}+\mathrm{H}_2 \text {(g)} \rightarrow\mathrm {H}_3 \mathrm {C} - \mathrm {CH}_3 \text {(g)}\)
(Use the following bond energy data:
H-C: 413 kJ/mole
H-H: 436 kJ/mole
C=C: 614 kJ/mole
C-C: 348 kJ/ mole )
1. -656 kJ/mole
2. -343 kJ/mole
3. -289 kJ/mole
4. -124 kJ/mole
\(\mathrm {H}_2 \mathrm{C} = \mathrm {CH}_2 \text {(g)}+\mathrm{H}_2 \text {(g)} \rightarrow\mathrm {H}_3 \mathrm {C} - \mathrm {CH}_3 \text {(g)}\)
(Use the following bond energy data:
H-C: 413 kJ/mole
H-H: 436 kJ/mole
C=C: 614 kJ/mole
C-C: 348 kJ/ mole )
1. -656 kJ/mole
2. -343 kJ/mole
3. -289 kJ/mole
4. -124 kJ/mole
Subtopic: Thermochemistry |
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Which of the following is the maximum energy available for useful work from a spontaneous reaction?
| 1. | Gibbs free energy | 2. | Lattice energy |
| 3. | Kinetic energy | 4. | Ionization energy |
Subtopic: Gibbs Energy Change |
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Calculate which species has a standard enthalpy of formation (ΔfH°) equal to zero for the following reaction:
C₂H₄(g) + 6F₂(g) → 2CF₄(g) + 4HF(g)
1. C₂H₄
2. F₂
3. CF₄
4. HF
Subtopic: Thermochemistry |
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What is the entropy change for the vaporization of water, if the molar heat of vaporization of water is \( +43.9~\text{kJ}\ mol^{-1}\) ?
1. \(8.49 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
2. \(4.184 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
3. \(2.78 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
4. \(118 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
1. \(8.49 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
2. \(4.184 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
3. \(2.78 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
4. \(118 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
Subtopic: Spontaneity & Entropy |
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The magnitude of work done by a gas during a reversible expansion along the path ABC, as shown in the figure, is:
| 1. | 44 Nm | 2. | 46 Nm |
| 3. | 48 Nm | 4. | 50 Nm |
Subtopic: Thermodynamics' Properties and process | First Law of Thermodynamics |
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Match the processes or properties in List-I with their corresponding characteristics in List-II.
Choose the correct answer from the options given below:
| List-I (Process/Property) |
List-II (Characteristic) |
||
| A. | Adiabatic process | I. | Independent of the amount of substance |
| B. | Reversible process | II. | The reaction can proceed in both directions, from reactants to products and vice versa |
| C. | Intensive property | III. | No transfer of heat between the system and the surrounding |
| D. | Extensive property | IV. | Dependent on the amount of substance |
| 1. | A-II, B-III, C-IV, D-I | 2. | A-I, B-II, C-IV, D-III |
| 3. | A-III, B-II, C-I, D-IV | 4. | A-I, B-II, C-III, D-IV |
Subtopic: Classification of System, Extensive & Intensive Properties |
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NEET - 2024
Hints
Which of the following statements is/are correct?
1. a and b
2. b, c and d
3. b and c
4. None of the above
| (a) | Heat is a way of transferring energy. |
| (b) | Heat is not a property of the system, whereas temperature is a property of the system. |
| (c) | Reactions that are accompanied by the evolution of heat are called endothermic reactions. |
| (d) | Those reactions in which heat is absorbed are known as exothermic reactions. |
1. a and b
2. b, c and d
3. b and c
4. None of the above
Subtopic: First Law of Thermodynamics | Classification of System, Extensive & Intensive Properties | Thermochemistry |
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