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 |
 81%
From NCERT
NEET - 2023
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Consider the following reaction:-

\(2H_2(g) + O_2(g) \rightarrow 2H_2O(g) \Delta_rH^\circ = -483.64 kJ. \)

What is the enthalpy change for the decomposition of one mole of water?
(Choose the right option).

1. 120.9 kJ
2. 241.82 kJ
3. 18 kJ
4. 100 kJ
Subtopic:  Thermochemistry |
 87%
From NCERT
NEET - 2023
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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 |
 84%
From NCERT
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 |
 68%
From NCERT
NEET - 2022
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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)
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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Which of the following options correctly represents the relationship between \(C_p \text { and } C_V\) for one mole of an ideal gas?

1. \(C_P=R C_V \)
2. \(C_V=RC_P \)
3. \(C_P+C_V=R \)
4. \(C_{\mathrm{P}}-\mathrm{C}_{\mathrm{V}}=\mathrm{R}\)

Subtopic:  Cp & Cv |
 86%
From NCERT
NEET - 2021
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For irreversible expansion of an ideal gas under isothermal condition, the correct option is :

1. U=0, Stotal0

2. U0, Stotal=0

3. U=0, Stotal=0

4. U0, Stotal0

Subtopic:  Spontaneity & Entropy |
 64%
From NCERT
NEET - 2021
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Hydrolysis of sucrose is given by the following reaction

Sucrose + H2 Glucose + Fructose

If the equilibrium constant (Kc) is 2×1013 at 300 K, the value of rG at the same temperature will be:

1. 8.314 J mol-1 K-1×300 K×ln (2×1013)

2. 8.314 J mol-1 K-1×300 K×ln (3×1013)

3. -8.314 J mol-1 K-1×300 K×ln (4×1013)

4. -8.314 J mol-1 K-1×300 K×ln (2×1013)

Subtopic:  Gibbs Energy Change |
 78%
From NCERT
NEET - 2020
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For the reaction, 2Cl(g)  Cl2(g), the correct option is:

1. rH>0 and rS<0

2. rH<0 and rS>0

3. rH<0 and rS<0

4. rH>0 and rS>0

Subtopic:  Enthalpy & Internal energy | Spontaneity & Entropy |
 60%
From NCERT
NEET - 2020
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If for a certain reaction rH is 30 kJ mol–1 at 450 K, the value of rS (in JK–1 mol–1) for which the same reaction will be spontaneous at the same temperature is:

1. 70

2. –33

3. 33

4. -70

Subtopic:  Spontaneity & Entropy |
 69%
From NCERT
NEET - 2020
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