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Q. No.
Statement I:
The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states (reference states) is called standard molar enthalpy of formation.
Statement II:
For, CaO(s)+ CO2 (g) → CaCO3(s) ; ∆fH⊝ = -178.3 kJmol-1 , the ∆rH⊝ is equal to the ∆fH⊝ .
1. Both statements I and II are true.
2. Statement I is true and statement II is false.
3. Both statements I and II are false.
4. Statement I is false, statement II is true.
1. Both statements I and II are true.
2. Statement I is true and statement II is false.
3. Both statements I and II are false.
4. Statement I is false, statement II is true.
Subtopic: Thermochemistry |
55%
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Select the correct option based on the statements below:
1. Both I and II are true.
2. I is true and II is false.
3. Both I and II are false.
4. I is false but II is true.
| Statement I: | Pressure, molar heat capacity, density, mole fraction, specific heat, temperature, and molarity are intensive properties. |
| Statement II: | Mass, internal energy, and heat capacity are extensive properties. |
1. Both I and II are true.
2. I is true and II is false.
3. Both I and II are false.
4. I is false but II is true.
Subtopic: Classification of System, Extensive & Intensive Properties |
72%
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| Assertion (A): | A process for which \(\Delta S_{system} > 0 \) as well as \(\Delta H > 0 \) passes from non-spontaneous to spontaneous state as temperature is increased. |
| Reason (R): | At higher temperatures, \(T \Delta S \) exceeds \(\Delta H \). |
| 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: Spontaneity & Entropy |
85%
From NCERT
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Assertion(A): \(C_p - C_v = R \), for 1 mole of an ideal gas.
Reason(R): R is equal to the work done when the temperature of one mole of an ideal gas is increased by 1º.
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.
Reason(R): R is equal to the work done when the temperature of one mole of an ideal gas is increased by 1º.
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 |
52%
From NCERT
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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.
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 |
64%
From NCERT
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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.
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 |
52%
From NCERT
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| 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 |
68%
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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.
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 |
55%
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| 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 |
65%
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| Assertion (A): | Mass and volume are extensive properties. |
| Reason (R): | Mass/volume is also an extensive parameter. |
| 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 |
80%
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