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Chemical Engineering :: Stoichiometry

  1. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is

  2. A.
    independent of the temperature.
    B.
    increased with the increase in pressure.
    C.
    decreased with the increase in pressure.
    D.
    unchanged by the pressure change.
    E.
    none of these

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  3. Molality is defined as the number of gm moles of solute per __________ of solvent.

  4. A.
    litre
    B.
    kg
    C.
    gm mole
    D.
    gm

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  5. Saturated molal absolute humidity of the vapor-gas mixture depends upon the

  6. A.
    vapor pressure at dry bulb temperature
    B.
    total pressure
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  7. At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to

  8. A.
    decrease in mean free path.
    B.
    increased collision rate among molecules.
    C.
    increase in molecular attraction.
    D.
    increase in average molecular speed.

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  9. 'Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the

  10. A.
    temperature vs. log (vapor pressure).
    B.
    vapor pressure vs. log (temperature).
    C.
    log (temperature) vs. log (vapor pressure).
    D.
    vapor pressure vs. temperature.

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  11. In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?

  12. A.
    Use of equation of state
    B.
    Fugacity co-efficient
    C.
    Activity co-efficient
    D.
    None of these

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  13. If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will

  14. A.
    be reduced to l/4th.
    B.
    increase four times.
    C.
    increase two times.
    D.
    none of these.

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  15. The OH- concentration in a solution having pH value 3 is

  16. A.
    10-3
    B.
    10-10
    C.
    10-11
    D.
    10-13

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  17. A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of

  18. A.
    3
    B.
    100
    C.
    1000
    D.
    none of these

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  19. The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg. ?

  20. A.
    0.2
    B.
    0.1
    C.
    0.4
    D.
    0.6

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