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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. When dilute aqueous solutions of two salts are mixed, the process is associated with

  2. A.
    decrease in temperature.
    B.
    increase in temperature.
    C.
    no change in temperature.
    D.
    change in temperature which is a function of composition.

  3. Pick out the correct statement.

  4. A.
    Like internal energy and enthalphy, the absolute value of standard entropy for elementary substances is zero.
    B.
    Melting of ice involves increase in enthalpy and a decrease in randomness.
    C.
    The internal energy of an ideal gas depends only on its pressure.
    D.
    Maximum work is done under reversible conditions.

  5. Chemical engineering thermodynamics is concerned with the __________ in/of chemical processes.

  6. A.
    reaction mechanism
    B.
    calculation of rates
    C.
    energy transformation from one form to the another
    D.
    none of these

  7. An isolated system can exchange __________ with its surroundings.

  8. A.
    matter
    B.
    energy
    C.
    neither matter nor energy
    D.
    both matter and energy

  9. Requisites of a reversible process is that the

  10. A.
    system and surroundings pressure be equal.
    B.
    friction in the system should be absent.
    C.
    system and surroundings temperature be equal.
    D.
    none of these.

  11. Fugacity is most helpful in

  12. A.
    representing actual behaviour of real gases.
    B.
    representing actual behaviour of ideal gases.
    C.
    the study of chemical equilibria involving gases at atmospheric pressure.
    D.
    none of these

  13. The energy of activation of exothermic reaction is

  14. A.
    zero.
    B.
    negative.
    C.
    very large compared to that for en-dothermic reaction.
    D.
    not possible to predict.

  15. Pick out the wrong statement.

  16. A.
    The chemical potential of a pure substance depends upon the temperature and pressure.
    B.
    The chemical potential of a component in a system is directly proportional to the escaping tendency of that component.
    C.
    The chemical potential of ith species (μi) in an ideal gas mixture approaches zero as the pressure or mole fraction (xi) tends to be zero at constant temperature.
    D.
    The chemical potential of species 'i' in the mixture (μi) is mathematically represented as, , where, n, ni and nj respectively denote the total number of moles, moles of ith species and all mole numbers except ith species. 'G' is Gibbs molar free energy.

  17. In the reaction; N2 + O2 2NO, increasing the pressure will result in

  18. A.
    shifting the equilibrium towards right,
    B.
    shifting the equilibrium towards left.
    C.
    no change in equilibrium condition.
    D.
    none of these.

  19. A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is

  20. A.
    349
    B.
    651
    C.
    667
    D.
    1000