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Assertion(A): Enthalpy of graphite is lower than that of a diamond.
Reason(R): Entropy of graphite is greater than that of a diamond.

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:  Thermochemistry |
 67%
Level 2: 60%+
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Assertion(A): The enthalpy of formation of gaseous oxygen molecules at 298 K under a pressure of one atm is zero.
Reason(R): The entropy of the formation of gaseous oxygen molecules under the same conditions is zero.

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:  Thermochemistry |
 54%
Level 3: 35%-60%
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Consider the given two statements:
Assertion (A): The temperature of a gas does not change when it undergoes an adiabatic expansion.
Reason (R): During an adiabatic process, the container should be a perfect conductor.
 
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:  Thermochemistry |
 64%
Level 2: 60%+
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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%
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Consider the given two statements:
Assertion (A): During an adiabatic process, heat energy is not exchanged between the system and its surroundings.
Reason (R): The temperature of a gas increases when it undergoes an adiabatic expansion.
 
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:  Thermodynamics' Properties and process |
 69%
Level 2: 60%+
Hints
Given below are two statements:
Assertion (A): Mass and volume are extensive properties.
Reason (R): Mass/volume is also an extensive property.
 
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:  Thermodynamics' Properties and process |
 82%
Level 1: 80%+
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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 |
 83%
Level 1: 80%+
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):  \(\Delta H\) 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 |
 66%
Level 2: 60%+
Hints
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Consider the given two statements:
Assertion (A): The molar entropy of vaporization of water is different from that of ethanol.
Reason (R): Water is more polar than ethanol.
 
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:  Thermochemistry |
 66%
Level 2: 60%+
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