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Q1:

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%

From NCERT

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Q2:

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 |

65%

From NCERT

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2

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Q3:

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.	(A) and (R) both are False.

Subtopic: Enthalpy & Internal energy |

73%

From NCERT

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Q4:

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 |

81%

From NCERT

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4

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Q5:

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%

From NCERT

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Q6:

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 H_r & Hp respectively, then for an endothermic reaction H_R < H_P.

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 |

80%

From NCERT

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4

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Q7:

Select the correct option based on statements below:

Assertion (A):	C_diamond → C_graphite ∆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 |

66%

From NCERT

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4

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Q8:

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) C_{P, m} – C_{V, m} = R
(IV) dU = C_VdT 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 |

56%

From NCERT

JEE

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Q9:

Consider the following diagram for a reaction $A \to C$ .

The nature of the reaction is-

1. Exothermic

2. Endothermic

3. Reaction at equilibrium

4. None of the above

Subtopic: Enthalpy & Internal energy |

84%

From NCERT

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Q10:

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%

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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 in the gaseous state.

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, \(\Delta E = 0 \).

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