Assertion(A): For an isothermal physical process, 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 and R is false.
4. A and R both are false.
Subtopic:  Enthalpy & Internal energy |
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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 gases.

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. A and R both are false.
Subtopic:  Enthalpy & Internal energy |
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Assertion(A): The increase in internal energy $$(\Delta E )$$ for the vapourization 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. A and R both are false.
Subtopic:  Enthalpy & Internal energy |
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 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 |
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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 and R is false.
4. A and R both are false.
Subtopic:  First Law of Thermodynamics | Enthalpy & Internal energy |
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Assertion:  $∆\mathrm{H}$ is positive for endothermic reactions.

Reason: If the total enthalpy of reactants and products are Hr & Hp respectively, then for an endothermic reaction HR < HP.

1. Both assertion & reason are true and the reason is the correct explanation of the assertion.

2. Both assertion & reason are true but the reason is not the correct explanation of the assertion.

3. Assertion is a true statement but reason is false.

4. Both assertion and reason are false statements.

Subtopic:  Enthalpy & Internal energy |
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Assertion: ${C}_{diamond}\to {C}_{graphite}$

Reason: Entropy increases during the conversion of diamond to graphite.

1. Both assertion & reason are true and the reason is the correct explanation of the assertion.

2. Both assertion & reason are true but the reason is not the correct explanation of the assertion.

3. Assertion is a true statement but reason is false.

4. Both assertion and reason are false statements.

Subtopic:  Enthalpy & Internal energy |
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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 |
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Consider the following diagram for a reaction $\mathrm{A}\to \mathrm{C}$

The nature of the reaction is-

1. Exothermic

2. Endothermic

3. Reaction at equilibrium

4. None of the above

Subtopic:  Enthalpy & Internal energy |
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Consider the following diagram for a reaction $\mathrm{A}\to \mathrm{C}$:

The nature of the reaction is-

1. Exothermic

2. Endothermic

3. Reaction at equilibrium

4. None of the above

Subtopic:  Enthalpy & Internal energy |
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