Q. No.Thermodynamics is not concerned about-
1. Energy changes involved in a chemical reaction
2. The extent to which a chemical reaction proceeds
3. The rate at which a reaction proceeds
4. The feasibility of a chemical reaction
1. Volume
2. Enthalpy
3. Molar heat capacity
4. Internal energy
The pair of isochoric among the transformation of state is:
1. K to L and L to M
2. L to M and N to K
3. L to M and M to N
4. M to N and N to K
\(1.~~\mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{g})\\ \\ 2.~~\mathrm{H}_{2}(g)+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\\ \\ 3.~~\mathrm{PCl}_{5}(g) \rightarrow \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)\\ 4.~~\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HI}(\mathrm{g}) \)
If water vapour is assumed to be a perfect gas, molar enthalpy change for vapourisation of 1 mol of water at 1 bar and 100°C is 41kJ mol–1. The internal energy change, when 1 mol of water is vapourised at 1 bar pressure and 100°C is-
1. 35.5 kJ mol–1
2. 37.9 kJ mol–1
3. 41 kJ mol–1
4. 44.2 kJ mol–1
A swimmer coming out from a pool is covered with a film of water weighing about 18g. The internal energy of vaporization at 298K. is-
∆vap H⊖ for water at 298K= 44.01kJ mol–1
1. 38.63 kJ
2. 43.82 J
3. 41.53 kJ
4. 40.33 J
| 1. | Molar Heat | 2. | Specific Heat |
| 3. | Entropy | 4. | Heat capacity |
| Assertion (A): | The increase in internal energy \((\Delta E ) \) for the vapourization 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. |
| 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 |
Choose the correct answer from the options given below:
1. A-I, B-III, C-II, D-IV
2. A-I, B-II, C-III, D-IV
3. A-III, B-I, C-IV, D-II
4. A-III, B-I, C-II, D-IV
An ideal gas expands isothermally from at 300 K against a constant pressure of . The work done by the gas is:
| 1. | +270 kJ | 2. | -900 J |
| 3. | +900 kJ | 4. | -900 kJ |
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