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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 |
Level 3: 35%-60%
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Given below are two statements:
| 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 |
Level 3: 35%-60%
Hints
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 |
Level 3: 35%-60%
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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 |
Level 3: 35%-60%
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Which of the following situations results in a reduction of the system's entropy?
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 |
Level 3: 35%-60%
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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 |
61%
Level 2: 60%+
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Q. No.
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