Assertion (A): Thermodynamic properties are macroscopic in nature. Reason (R): When a gas expands into a vacuum, the work done by it 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, but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Thermodynamics' Properties and process | First Law of Thermodynamics |
81%
From NCERT
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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 |
54%
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.
Subtopic:  First Law of Thermodynamics |
51%
From NCERT
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Select the correct option based on statements below:
 Assertion (A): Work done in an irreversible isothermal process at constant volume is zero. Reason (R): Work is assigned a negative sign during expansion and is assigned a positive sign during compression.

 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 |
76%
From NCERT
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Select the correct option based on statements below:
 Assertion (A): Total enthalpy change of a multistep process is the sum of  ∆H1 + ∆H2 + ∆H3 + . . . . . Reason (R): When heat is absorbed by the system, the sign of q is taken to be negative.

 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 |
78%
From NCERT
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The correct statements among the following are :

 a. The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ b. The enthalpy of two moles of ZnO is more than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ c. 693 . 8   kJ mol -1  energy is evolved in the reaction d. 693 . 8   kJ mol -1  energy is absorbed in the reaction

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, c)

Subtopic:  First Law of Thermodynamics |
69%
From NCERT
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A sample containing 1.0 mol of an ideal gas is expanded isothermally and reversible to ten times of its original volume in two separate experiments. The expansion is carried out at 300 K and at 600 K respectively.

The correct statements among the following are-

 a. Work done at 600 K is 20 times the work done at 300 K b. Work done at 300 K is twice the work done at 600 K c. Work done at 600 K is twice the work done at 300 K d. ∆ U = 0  in both cases

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Subtopic:  First Law of Thermodynamics |
80%
From NCERT
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For the graph given below, it can be concluded that work done during the process shown will be-

 1 Zero 2 Negative 3 Positive 4 Cannot be determined
Subtopic:  First Law of Thermodynamics |
65%
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Consider the following graph.

The work done shown by the above-mentioned graph is-

 1 Positive 2 Negative 3 Zero 4 Cannot be determined
Subtopic:  First Law of Thermodynamics |
71%
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1.0 mol of a monoatomic ideal gas is expanded from state (1) to state (2) as shown in the graph below:

The work done for the expansion of gas from state (1) to state (2) at 298 K will be

1. 1617.6 J

2. -1617.6 J

3. 1717.6 J

4. -1717.6 J

Subtopic:  First Law of Thermodynamics |
60%
From NCERT
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