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Q. No.Consider the following reaction:
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g) \Delta_rH^\circ = -483.64 kJ. }\)
What is the enthalpy change for the decomposition of one mole of water?
1. 120.9 kJ
2. 241.82 kJ
3. 18 kJ
4. 100 kJ
Subtopic: Thermochemistry |
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NEET - 2023
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What is the correct relationship between changes in enthalpy and internal energy within the following options?
1. \(\Delta \mathrm{H}+\Delta \mathrm{U}=\Delta \mathrm{nR} \)
2. \(\Delta \mathrm{H}=\Delta \mathrm{U -\Delta n_gRT}\)
3. \(\Delta \mathrm{H}=\Delta \mathrm{U+\Delta n_gRT }\)
4. \(\Delta \mathrm{H} -\Delta \mathrm{U=-\Delta n_gRT}\)
1. \(\Delta \mathrm{H}+\Delta \mathrm{U}=\Delta \mathrm{nR} \)
2. \(\Delta \mathrm{H}=\Delta \mathrm{U -\Delta n_gRT}\)
3. \(\Delta \mathrm{H}=\Delta \mathrm{U+\Delta n_gRT }\)
4. \(\Delta \mathrm{H} -\Delta \mathrm{U=-\Delta n_gRT}\)
Subtopic: Enthalpy & Internal energy |
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NEET - 2023
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One mole of an ideal gas at 300 K is expanded isothermally from 1 L to 10 L volume. \(\Delta U\) for this process is:
(Use R = 8.314 J K–1 mol–1)
(Use R = 8.314 J K–1 mol–1)
| 1. | 1260 J | 2. | 2520 J |
| 3. | 5040 J | 4. | 0 J |
Subtopic: First Law of Thermodynamics |
78%
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NEET - 2022
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The work done when 1 mole of gas expands reversibly and isothermally from a pressure of 5 atm to 1 atm at 300 K is:
(Given log 5 = 0.6989 and R = 8.314 J K-1 mol-1)
1. zero J
2. 150 J
3. +4014.6 J
4. -4014.6 J
Subtopic: First Law of Thermodynamics |
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NEET - 2022
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Subtopic: 2nd & 3rd Law of Thermodynamics |
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NEET - 2022
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Match List I with List II.
Choose the correct answer from the options given below :
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. \(\text { A-IV, B-III, C-II, D-I }\)
| List I | List II |
| (Process) | (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 |
Choose the correct answer from the options given below :
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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NEET - 2024
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In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from \(130~\text{K}\) to \(0~\text{K}.\)
C. \(2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}\)
D. \(\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}\)
Choose the correct answer from the options given below :
1. \(\text { A, B and D }\)
2. \(\text { A, C and D }\)
3. \(\text { C and D }\)
4. \(\text { A and C }\)
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from \(130~\text{K}\) to \(0~\text{K}.\)
C. \(2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}\)
D. \(\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}\)
Choose the correct answer from the options given below :
1. \(\text { A, B and D }\)
2. \(\text { A, C and D }\)
3. \(\text { C and D }\)
4. \(\text { A and C }\)
Subtopic: Spontaneity & Entropy |
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NEET - 2024
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The work done during reversible isothermal expansion of one mole of hydrogen gas at 25°C from pressure of 20 atmosphere to 10 atmosphere is :
( Given R = 2.0 cal K-1 mol-1)
1. -413.14 calories
2. 413.14 calories
3. 100 calories
4. 0 calorie
( Given R = 2.0 cal K-1 mol-1)
1. -413.14 calories
2. 413.14 calories
3. 100 calories
4. 0 calorie
Subtopic: First Law of Thermodynamics |
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From NCERT
NEET - 2024
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The standard enthalpy of neutralization is \(-57.3 \mathrm{~K}{\mathrm{J}}~ \mathrm{mol}^{-1}\)as:
\(\small{\underset{\text{strong acid}}{\mathrm{HCl_{(aq)}}}+\underset{\text{strong base}}{\mathrm{NaOH_{(aq)}}}\rightarrow\mathrm{NaCl_{(aq)}+H_2O(l),\Delta H=-57.3~KJ mol^{-1}}} \)
The enthalpy of neutralization of \(0.25 \mathrm{~mol}\) of HCI by \(0.25 \mathrm{~mol}\) of \(\mathrm{NaOH}\) is :
1. \(-57.3~ \mathrm{kJ} ~\mathrm{mol}^{-1}\)
2. \(-28.3 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3. \(-14.32 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4. \(+57.3~ \mathrm{kJ}~ \mathrm{mol}^{-1}\)
\(\small{\underset{\text{strong acid}}{\mathrm{HCl_{(aq)}}}+\underset{\text{strong base}}{\mathrm{NaOH_{(aq)}}}\rightarrow\mathrm{NaCl_{(aq)}+H_2O(l),\Delta H=-57.3~KJ mol^{-1}}} \)
The enthalpy of neutralization of \(0.25 \mathrm{~mol}\) of HCI by \(0.25 \mathrm{~mol}\) of \(\mathrm{NaOH}\) is :
1. \(-57.3~ \mathrm{kJ} ~\mathrm{mol}^{-1}\)
2. \(-28.3 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3. \(-14.32 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4. \(+57.3~ \mathrm{kJ}~ \mathrm{mol}^{-1}\)
Subtopic: Thermochemistry |
NEET - 2024
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Match List-I with List-II:
Choose the correct answer from the options given below:
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
| List-I (Process/Property) |
List-II (Characteristic) |
||
| A. | Adiabatic process | I. | Independent of amount of substance |
| B. | Reversible process | II. | Both way process reactant to product and vice-versa |
| C. | Intensive property | III. | No transfer of heat between system and surrounding |
| D. | Extensive property | IV. | Dependent on 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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