At standard conditions, if the change in the enthalpy for the following reaction is –109 kJ mol–1
H2(g)+Br2(g)2HBr(g) and the bond energy of H2 and Br2 is 435 kJ mol–1 and 192 kJ mol–1 respectively, what is the bond energy (in kJ mol–1) of HBr?
1. | 368 | 2. | 736 |
3. | 518 | 4. | 259 |
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. |
Assertion (A): | Specific heat is an intensive property. |
Reason (R): | Heat capacity is 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. |
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. |
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): | 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. |
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. |
The equilibrium constant for a reaction is 10. The value of will be:
( )
For the reaction 2A(g) + B(g) → 2D(g) ; ∆U° = - 10.5 kJ and ∆S° = - 44.1 J K-1, the value of ∆G° for the given reaction would be-
1. 1.6 J
2. -0.16 kJ
3. 0.16 kJ
4. 1.6 kJ