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Q. No.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.
\(\text { A and C }\)
Subtopic: Spontaneity & Entropy |
75%
From NCERT
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)
(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 |
72%
From NCERT
NEET - 2024
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NEET 2025 - Target Batch
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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 |
62%
NEET - 2024
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NEET 2025 - Target Batch
Hints
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 |
93%
From NCERT
NEET - 2024
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Enthalpy of combustion of carbon to carbon dioxide is \(-390.0~\text{kJ mol}^{-1}.\) The amount of heat released when \(35.0~\text{g}\) of \(\mathrm{CO_2}\) is formed from the reaction of carbon and dioxygen gas, is:
| 1. | \(310~\text{kJ}\) | 2. | \(490~\text{kJ}\) |
| 3. | \(245~\text{kJ}\) | 4. | \(700~\text{kJ}\) |
Subtopic: Enthalpy & Internal energy |
76%
From NCERT
NEET - 2024
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
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 (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 |
87%
From NCERT
NEET - 2024
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NEET 2025 - Target Batch
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The specific heat of tungsten is 0.03 cal/g-°C. If a 50-gram sample of tungsten absorbs 100 calories of heat, the change in temperature of the sample will be:
1. 76 °C
2. 55 °C
3. 67 °C
4. 62 °C
1. 76 °C
2. 55 °C
3. 67 °C
4. 62 °C
Subtopic: Cp & Cv |
78%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
If it’s discovered that a certain non-spontaneous reaction becomes spontaneous if the temperature is lowered, then which of the following must be true:
1. ∆S is negative and ∆H is positive.
2. ∆S is negative and ∆H is negative.
3. ∆S is positive and ∆H is positive.
4. ∆S is positive and ∆H is negative.
1. ∆S is negative and ∆H is positive.
2. ∆S is negative and ∆H is negative.
3. ∆S is positive and ∆H is positive.
4. ∆S is positive and ∆H is negative.
Subtopic: Spontaneity & Entropy |
51%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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?
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g) \Delta_rH^\circ = -483.64 kJ. }\)
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 |
88%
From NCERT
NEET - 2023
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NEET 2025 - Target Batch
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What is the correct relationship between changes in enthalpy and internal energy within the following options?
1. \(\mathrm{\Delta {H}+\Delta {U}=\Delta {nR}} \)
2. \(\mathrm{\Delta {H}=\Delta {U -\Delta n_gRT}}\)
3. \(\mathrm{\Delta {H}=\Delta {U+\Delta n_gRT }}\)
4. \(\mathrm{\Delta {H} -\Delta {U=-\Delta n_gRT}}\)
1. \(\mathrm{\Delta {H}+\Delta {U}=\Delta {nR}} \)
2. \(\mathrm{\Delta {H}=\Delta {U -\Delta n_gRT}}\)
3. \(\mathrm{\Delta {H}=\Delta {U+\Delta n_gRT }}\)
4. \(\mathrm{\Delta {H} -\Delta {U=-\Delta n_gRT}}\)
Subtopic: Enthalpy & Internal energy |
83%
From NCERT
NEET - 2023
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NEET 2025 - Target Batch
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