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Q. No.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
Subtopic: Thermochemistry |
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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. \(\mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g}) \rightarrow 2 \mathrm{HI}(\mathrm{g})\)
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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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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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
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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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When it is difficult to determine the enthalpy of a reaction experimentally, which method can be used to calculate the enthalpy indirectly?
1. Kirchhoff's equation
2. Hess's law
3. Henry's law
4. Van't Hoff law
1. Kirchhoff's equation
2. Hess's law
3. Henry's law
4. Van't Hoff law
Subtopic: Thermochemistry |
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Match List I with List II.
Choose the correct answer from the options given below:
| List-I (Process) | List-II (Conditions) | ||
| A. | Isothermal process | I. | No heat exchange |
| B. | Isochoric process | II. | Carried out at constant temperature |
| C. | Isobaric process | III. | Carried out at constant volume |
| D. | Adiabatic process | IV. | Carried out at constant pressure |
| 1. | \(\text { A-IV, B-II, C-III, D-I }\) | 2. | \(\text { A-I, B-II, C-III, D-IV }\) |
| 3. | \(\text { A-II, B-III, C-IV, D-I }\) | 4. | \(\text { A-IV, B-III, C-II, D-I }\) |
Subtopic: Thermodynamics' Properties and process |
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Level 1: 80%+
NEET - 2024
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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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