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Activity co-efficient is a measure of the

A. Departure from ideal solution behaviour

B. Departure of gas phase from ideal gas law

C. Vapour pressure of liquid

D. None of these

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  1. Degree of freedom of the system ice-watervapour will be
  2. If atmospheric temperature and dew point are nearly equal, then the relative humidity is
  3. No work is done by the system, when a reaction occurs at constant
  4. The gas law (PV = RT) is true for an __________ change.
  5. The equation, PV = nRT, is best obeyed by gases at
  6. Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the
  7. An irreversible process
  8. Sublimation temperature of dry ice (solid CO2) is __________ °C.
  9. Dry ice is
  10. Absorption/evolution of heat during conversion of a substance from one allotropic form to another is…
  11. Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition…
  12. Critical temperature is defined as the temperature above which a gas will
  13. The internal energy of an ideal gas does not change in a reversible __________ process.
  14. Isobaric process means a constant process.
  15. Which of the following will increase the volume of a real gas by four times?
  16. Which is not constant for an ideal gas?
  17. The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in…
  18. Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of
  19. Adiabatic compression of a saturated water vapour makes it
  20. The expression, nCv(T2 - T1), is for the __________ of an ideal gas.
  21. Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C…
  22. Which of the following non-flow reversible compression processes require maximum work?
  23. In a working refrigerator, the value of COP is always
  24. Compressibility factor of a gas is
  25. Pick out the wrong statement.
  26. One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one
  27. For a constant pressure reversible process, the enthalpy change (ΔH) of the system is
  28. The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while…
  29. The activity of an ideal gas is numerically __________ its pressure.
  30. At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero.…