- 1(current)
Q. No.| Assertion (A): | For an isothermal physical process, the change in internal energy is equal to zero. |
| Reason (R): | The internal energy is directly proportional to temperature for physical processes. |
| 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. | Both (A) and (R) are false. |
Subtopic: Enthalpy & Internal energy |
83%
Level 1: 80%+
Hints
| Assertion (A): | \(\Delta H\) and \(\Delta E\) are almost the same for the reaction, \(N_{2(g)} + O_{2(g)} \rightleftharpoons 2NO_(g)\) |
| Reason(R): | All reactants and products are in the gaseous state. |
| 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 and (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Enthalpy & Internal energy |
67%
Level 2: 60%+
Hints
Given below are two statements:
| Assertion (A): | The increase in internal energy \((\Delta E ) \) for the vapourisation of one mole of water at 1 atm and 373 K is zero. |
| Reason (R): | For all isothermal processes, \(\Delta E = 0 \). |
| 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 and (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Enthalpy & Internal energy |
72%
Level 2: 60%+
Hints
| Assertion (A) | Absolute values of the internal energy of substances cannot be determined. |
| Reason (R) | It is impossible to determine the exact values of constituent energies of the substances. |
| 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. | Both (A) and (R) are False. |
Subtopic: Enthalpy & Internal energy |
83%
Level 1: 80%+
Hints
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| Assertion (A): | Heat energy is completely transformed into work during the isothermal expansion of a gas. |
| Reason (R): | During an isothermal process, the changes in the internal energy of a gas due to a decrease in pressure are nullified by the changes due to an increase in volume. |
| 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. | Both (A) and (R) are False. |
Subtopic: First Law of Thermodynamics | Enthalpy & Internal energy |
59%
Level 3: 35%-60%
Hints
Select the correct option based on statements below:
| Assertion (A): | ∆H is positive for endothermic reactions. |
| Reason (R): | If the total enthalpy of reactants and products are Hr & Hp respectively, then for an endothermic reaction HR < HP. |
| 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. | Both (A) and (R) are false. |
Subtopic: Enthalpy & Internal energy |
81%
Level 1: 80%+
Hints
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Select the correct option based on statements below:
| Assertion (A): | Cdiamond → Cgraphite ∆H and ∆U are the same for this reaction. |
| Reason (R): | Entropy increases during the conversion of diamond to graphite. |
| 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. | Both (A) and (R) are false. |
Subtopic: Enthalpy & Internal energy |
67%
Level 2: 60%+
Hints
For one mole of an ideal gas, which of these statements must be true?
(I) U and H each depend only on temperature.
(II) Compressibility factor z is not equal to 1.
(III) CP, m – CV, m = R
(IV) dU = CVdT for any process.
1. (I), (III) and (IV)
2. (II), (III) and (IV)
3. (III) and (IV)
4. (I) and (III)
Subtopic: Enthalpy & Internal energy |
55%
Level 3: 35%-60%
JEE
Hints
Consider the following diagram for a reaction .
The nature of the reaction is-
1. Exothermic
2. Endothermic
3. Reaction at equilibrium
4. None of the above
Subtopic: Enthalpy & Internal energy |
84%
Level 1: 80%+
Hints
What is the nature of the reaction depicted in the given diagram for A→C?
| 1. | Exothermic | 2. | Endothermic |
| 3. | Reaction at equilibrium | 4. | None of these |
Subtopic: Enthalpy & Internal energy |
83%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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