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:  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: CdiamondCgraphite

H and U are same for this reaction.

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 AC


      

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 AC:


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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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology