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Which of the following is not a reversible process?

A. Expansion of an ideal gas against constant pressure

B. Atmospheric pressure vaporisation of water at 100°C

C. Solution of NaCl in water at 50°C

D. None of these

Correct Answer : C.


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  1. For an isothermal reversible compression of an ideal gas
  2. Pick out the wrong statement.
  3. The change in Gibbs free energy for vaporisation of a pure substance is
  4. Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O CO2 + H2, by
  5. Entropy change in case of reversible adiabatic process is
  6. What happens in a reversible adiabatic compression?
  7. The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is
  8. The most important application of distribution law is in
  9. Pick out the correct statement.
  10. The second law of thermodynamics states that
  11. In any spontaneous process, the __________ free energy decreases.
  12. In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through…
  13. The temperature at which both liquid and gas phases are identical, is called the __________ point.
  14. The standard state of a gas (at a given temperature) is the state in which fugacity is equal to
  15. Near their critical temperatures, all gases occupy volumes __________ that of the ideal gas.
  16. dW and dq are not the exact differential, because q and W are
  17. The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium,…
  18. Fugacity is a measure of the
  19. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 >…
  20. A system undergoes a change from a given initial state to a given final state either by an irreversible…
  21. Which law of the thermodynamics provides basis for measuring the thermodynamic property?
  22. Pick out the wrong statement.
  23. Fundamental principle of refrigeration is based on the __________ law of thermodynamics.
  24. The ammonia synthesis reaction represented by N2 + 3H2 2NH3; ΔH = - 22.4 kcal, is
  25. The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria…
  26. Water on heating from 1 to 4°C
  27. Consider the process A & B shown in the figure given below: In this case, it is possible that
  28. For the reversible exothermic reaction, N2 + 3H2 2NH3, increase of pressure would
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  30. Which of the following diagrams does not represent an Otto cycle?