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Chemical Engineering :: Stoichiometry

  1. Pick out the wrong unit conversion of temperature.

  2. A.
    °R = 273 + °F
    B.
    temperature difference of 1°K = 1°C = °F
    C.
    °C = (F- 32) x 0.555
    D.
    °F = (°C + 17.778) x 1.8

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  3. "The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes". This is the __________ law.

  4. A.
    Dalton's
    B.
    Amgat's
    C.
    GayLussac's
    D.
    Avogadro's

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  5. The osmotic pressure of a solution is directly proportional to the

  6. A.
    lowering of vapor pressure.
    B.
    molecular concentration of the solute.
    C.
    absolute temperature of a given concentration.
    D.
    all (a), (b) and (c).

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  7. Which of the following is not a unit of pressure?

  8. A.
    Parsec
    B.
    Kilo-pascal
    C.
    Bar
    D.
    Newton/metre2

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  9. Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution).

  10. A.
    B.
    C.
    D.
    none of these

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  11. Raoult's law is not applicable to the

  12. A.
    solutes which dissociate or associate in the particular solution.
    B.
    concentrated solutions.
    C.
    both(b)&(c)
    D.
    solutions containing non-volatile solute.

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  13. A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is

  14. A.
    N2O4
    B.
    N2O5
    C.
    N2O3
    D.
    none of these

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  15. The atomic heat capacities of all solid elements __________ with decrease in temperature.

  16. A.
    increases
    B.
    decreases
    C.
    remains unchanged
    D.
    approach zero at 0°C

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  17. Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

  18. A.
    sizes of the component molecules are approximately equal.
    B.
    attractive forces between like and unlike molecules are approximately equal.
    C.
    component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution.
    D.
    all (a), (b) & (c).

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  19. The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is

  20. A.
    H2O > C2H5OH > CS2
    B.
    CS2 > C2H5OH > H2O
    C.
    H2O > CS2 > C2H5OH
    D.
    CS2 > H2O > C2H5OH

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