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. |
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
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 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. |
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 |
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 |