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Chemical Engineering :: Stoichiometry

  1. N₂ content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)

  2. A.

     80%

    B.

     90%

    C.

     95%

    D.

     98%


  3. Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is

  4. A.

     1.72

    B.

     0.58

    C.

     0.5

    D.

     0.2


  5. __________ equation gives the effect of temperature on heat of reaction.

  6. A.

     Kirchoffs

    B.

     Maxwell's

    C.

     Antonie

    D.

     Kistyakowsky


  7. For the gaseous phase reaction, N₂ + O₂ ⇋ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by

  8. A.

     Increasing the concentration of N₂

    B.

     Decrease in temperature

    C.

     Increase in pressure

    D.

     Decrease in pressure


  9. The most convenient way of expressing solution concentration is in terms of

  10. A.

     Mole fraction

    B.

     Normality

    C.

     Molality

    D.

     Molarity


  11. For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become

  12. A.

     P/3

    B.

     3P

    C.

     9P²

    D.

     9P


  13. For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).

  14. A.

     Inversely

    B.

     Exponentially

    C.

     Linearly

    D.

     Negligibly


  15. N.T.P. corresponds to

  16. A.

     1 atm.absolute pressure& 0°C

    B.

     760 mm Hg gauge pressure & 0°C

    C.

     760 torr & 15°C

    D.

     101.325 KPa gauge pressure & 0°C


  17. Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.

  18. A.

     Lower than

    B.

     Higher than

    C.

     Equal to

    D.

     Either A or B; depends on the liquids


  19. Which of the following is an exothermic reaction?

  20. A.

     Conversion of graphite to diamond

    B.

     Decomposition of water

    C.

     Dehydrogenation of ethane to ethylene

    D.

     None of these