# 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 |
86%
From NCERT
NEET - 2023
Hints

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. $$\Delta \mathrm{H} -\Delta \mathrm{U=-\Delta n_gRT}$$
Subtopic:  Enthalpy & Internal energy |
80%
From NCERT
NEET - 2023
Hints

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)
 1 1260 J 2 2520 J 3 5040 J 4 0 J
Subtopic:  First Law of Thermodynamics |
78%
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch

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 |
69%
From NCERT
NEET - 2022
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Which p-V curve among the following depicts the highest amount of work done?

 1 2 3 4
Subtopic:  2nd & 3rd Law of Thermodynamics |
85%
From NCERT
NEET - 2022
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Match List I with List II.
 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 |
83%
From NCERT
NEET - 2024
Hints

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 |
71%
From NCERT
NEET - 2024
Hints

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

Subtopic:  First Law of Thermodynamics |
67%
From NCERT
NEET - 2024
Hints

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. $$+57.3~ \mathrm{kJ}~ \mathrm{mol}^{-1}$$
Subtopic:  Thermochemistry |
60%
NEET - 2024
Hints

Match List-I with List-II:
 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
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
Subtopic:  Classification of System, Extensive & Intensive Properties |
91%
NEET - 2024