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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. Sublimation temperature of dry ice (solid CO₂) is __________ °C.

  2. A.

     -273

    B.

     0

    C.

     -78

    D.

     5


  3. The equation relating E, P, V and T which is true for all substanes under all conditions is given by (∂E/∂V)T = T.(∂P/∂T)H - P . This equation is called the

  4. A.

     Maxwell

    B.

     Thermodynamic equation of state

    C.

     Equation of state

    D.

     Redlich-Kwong equation of state


  5. Henry's law is closely obeyed by a gas, when its __________ is extremely high.

  6. A.

     Pressure

    B.

     Solubility

    C.

     Temperature

    D.

     None of these


  7. If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero.

  8. A.

     Enthalpy

    B.

     Volume

    C.

     Both A & B

    D.

     Neither A nor B


  9. The ammonia synthesis reaction represented by N₂ + 3H₂ ⇋ 2NH₃ ; ΔH = - 22.4 kcal, is

  10. A.

     Endothermic

    B.

     Exothermic

    C.

     Isothermal

    D.

     Adiabatic


  11. Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is

  12. A.

     Slower than Y

    B.

     Faster than Y

    C.

     Three times slower than Y

    D.

     Three times faster than Y


  13. Which of the following has the minimum value of COP for a given refrigeration effect?

  14. A.

     Reverse Carnot cycle

    B.

     Ordinary vapour-compression cycle

    C.

     Vapour-compression process with a reversible expansion engine

    D.

     Air refrigeration cycle


  15. No work is done by the system, when a reaction occurs at constant

  16. A.

     Volume

    B.

     Temperature

    C.

     Pressure

    D.

     None of these


  17. In the reaction, H₂ +I₂ ⇋ 2HI, addition of an inert gas will

  18. A.

     Increase the partial pressure of H₂

    B.

     Increase the partial pressure of I₂

    C.

     Increase the total pressure and hence shift the equilibrium towards the right

    D.

     Not effect the equilibrium conditions


  19. The work done in isothermal compression compared to that in adiabatic compression will be

  20. A.

     Less

    B.

     More

    C.

     Same

    D.

     More or less depending upon the extent of work done