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Q. No.For an isolated system, if ΔU=0, then what is the value of ΔS?
| 1. | ΔS=0 | 2. | ΔS > 0 |
| 3. | ΔS < 0 | 4. | ΔS is not defined |
Subtopic: Spontaneity & Entropy |
From NCERT
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| Assertion (A): | Decrease in free energy causes a spontaneous reaction. |
| Reason (R): | Spontaneous reactions are invariably exothermic reactions. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Spontaneity & Entropy |
From NCERT
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
What is the entropy change (\(\Delta S\)) for water at its boiling point of 100°C, expressed in cal K⁻¹ mol⁻¹?
[For water \(\Delta H_{vap} = 540 ~cal~ g^{-1} \) ]
1. 540
2. 1.45
3. 26.06
4. 35.60
[For water \(\Delta H_{vap} = 540 ~cal~ g^{-1} \) ]
1. 540
2. 1.45
3. 26.06
4. 35.60
Subtopic: Spontaneity & Entropy |
From NCERT
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At equilibrium, which of the following is always zero?
| 1. | \(\Delta H\) | 2. | \(\Delta S_{Total}\) |
| 3. | \(\Delta S_{System}\) | 4. | \(\Delta G^o\) |
Subtopic: Spontaneity & Entropy |
From NCERT
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In which of the following case, does the entropy decrease?
1. Boiling of egg
2. Combustion of benzene at 27oC
3. Combustion of benzene at 127oC
4. Dissolution of sugar in water
Subtopic: Spontaneity & Entropy |
From NCERT
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When solid sodium hydroxide, \(\mathrm{NaOH}(\mathrm{s})\), is added to water at \(25^{\circ} \mathrm{C}\), it dissolves and the temperature of the solution increases. Which of the following is true for the values of \(\Delta H\) and \(\Delta S\) for the dissolving process?
| \(\Delta H\) | \(\Delta S\) | |
| 1. | + | + |
| 2. | + | - |
| 3. | - | - |
| 4. | - | + |
Subtopic: Spontaneity & Entropy |
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