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Q. No.
Assertion (A):
All combustion reactions are exothermic.
Reason (R):
For an exothermic reaction, enthalpies of products are greater than enthalpies of reactants \({(\Sigma v_p\Delta_fH(P)> \Sigma v_R\Delta_fH(R))}\).
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 |
63%
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| 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. | (A) and (R) both are False. |
Subtopic: Enthalpy & Internal energy |
74%
From NCERT
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Match List I with List II:
Choose the correct answer from the options given below:
| List I | List II | ||
| A. | \(\Delta H = q \) | I. | \(P_{ext} =0 \) |
| B. | Free expansion | II. | Heat |
| C. | Path function | III. | At constant pressure |
| D. | Reversible process | IV. | An infinitely slow process that proceeds through a series of equilibrium states |
| Options: | (A) | (B) | (C) | (D) |
| 1. | I | III | II | IV |
| 2. | I | II | III | IV |
| 3. | III | I | IV | II |
| 4. | III | I | II | IV |
Subtopic: Classification of System, Extensive & Intensive Properties | Cp & Cv |
80%
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The amount of heat required to raise the temperature of a body through 1 \(^\circ C\) is called its:
| 1. | Molar Heat | 2. | Specific Heat |
| 3. | Entropy | 4. | Heat capacity |
Subtopic: Cp & Cv |
68%
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Identify the species among the following for which \(\Delta_fH^\circ\) is non-zero:
1. \(S_\text{monoclinic}\)
2. \(C_\text{graphite}\)
3. H2(g)
4. \(O_2(g)\)
1. \(S_\text{monoclinic}\)
2. \(C_\text{graphite}\)
3. H2(g)
4. \(O_2(g)\)
Subtopic: Thermochemistry |
79%
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For the given reaction:
\(2A(g) + B(g) + C(s) \rightarrow 2D(g) \)
\(\Delta \mathrm{U}^{\circ}=-10.5 \mathrm{~kJ} \text { and } \Delta \mathrm{S}^{\circ}=-44.1 \mathrm{JK}^{-1} \)
The value of \(\Delta G^o \) for the above reaction at 25 °C will be :
\(2A(g) + B(g) + C(s) \rightarrow 2D(g) \)
\(\Delta \mathrm{U}^{\circ}=-10.5 \mathrm{~kJ} \text { and } \Delta \mathrm{S}^{\circ}=-44.1 \mathrm{JK}^{-1} \)
The value of \(\Delta G^o \) for the above reaction at 25 °C will be :
| 1. | 1.2 kJ | 2. | 0.16 kJ |
| 3. | 3.2 kJ | 4. | 1.6 kJ |
Subtopic: Gibbs Energy Change |
57%
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The work done when 1 mole of gas expands reversibly and isothermally from a pressure of 5 atm to 1 atm at 300 K is:
(Given log 5 = 0.6989 and R = 8.314 J K-1 mol-1)
1. zero J
2. 150 J
3. +4014.6 J
4.-4014.6 J
Subtopic: First Law of Thermodynamics |
73%
From NCERT
NEET - 2022
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Given the reaction: \(A + B \rightarrow C+D - q~ cal. \) is found to have a positive entropy change. The reaction will be:
| 1. | Possible at high temperature. |
| 2. | Possible only at low temperatures. |
| 3. | Not possible at any temperature. |
| 4. | Possible at any temperature. |
Subtopic: Spontaneity & Entropy |
56%
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The intensive property among the following is:
1. Volume
2. Enthalpy
3. Molar heat capacity
4. Internal energy
1. Volume
2. Enthalpy
3. Molar heat capacity
4. Internal energy
Subtopic: Classification of System, Extensive & Intensive Properties |
74%
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For which of the following equations, \(\Delta H > \Delta E \)?
\(1.~~\mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{g})\\ \\ 2.~~\mathrm{H}_{2}(g)+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\\ \\ 3.~~\mathrm{PCl}_{5}(g) \rightarrow \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)\\ 4.~~\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HI}(\mathrm{g}) \)
\(1.~~\mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{g})\\ \\ 2.~~\mathrm{H}_{2}(g)+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\\ \\ 3.~~\mathrm{PCl}_{5}(g) \rightarrow \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)\\ 4.~~\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HI}(\mathrm{g}) \)
Subtopic: Enthalpy & Internal energy |
79%
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