Statement I: | Total enthalpy change of a multistep process is the sum of ∆H1 + ∆H2 + ∆H3 + . . . |
Statement II: | When heat is absorbed by the system, the sign of q is taken to be negative. |
1. | Statement I is correct; Statement II is correct. |
2. | Statement I is correct; Statement II is incorrect. |
3. | Statement I is incorrect; Statement II is correct. |
4. | Statement I is incorrect; Statement II is incorrect. |
Assertion (A): | ∆H is positive for endothermic reactions. |
Reason (R): | If the total enthalpy of reactants and products are Hr & Hp respectively, then for an endothermic reaction HR < HP. |
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. |
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. |
Assertion (A): | Combustion is an exothermic process. |
Reason (R): | Combustion is a spontaneous process. |
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. |
Assertion (A): | Dissolution of sugar in water proceeds via an increase in entropy. |
Reason (R): | Entropy decreases, when an egg is boiled hard. |
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. |
Statement I. | Specific heat is an intensive property. |
Statement II. | Heat capacity is an extensive property. |
1. | Statement I is correct; Statement II is correct. |
2. | Statement I is correct; Statement II is incorrect. |
3. | Statement I is incorrect; Statement II is correct. |
4. | Statement I is incorrect; Statement II is incorrect. |
Assertion (A): | Cdiamond → Cgraphite ∆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. |
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)
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)
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 |