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Chemical Engineering :: Stoichiometry

  1. Avogadro's number is equal to

  2. A.
    6.023 x 1023 molecules/kg.mole.
    B.
    6.023 x 1023 molecules/gm.mole.
    C.
    6.023 x 1016 molecules/kg.mole.
    D.
    6.023 x 1026 molecules/gm.mole.

  3. The vapour pressure of a solution (made by dissolving a solute in a solvent) is __________ that of the pure solvent.

  4. A.
    less than
    B.
    more than
    C.
    equal to
    D.
    either more or less; depends on the solvent

  5. The amount of Zn (atomic weight = 65) required to form 224 c.c. of H2 at N.T.P. on treatment with dilute H2SO4 will be __________ gm.

  6. A.
    0.065
    B.
    0.65
    C.
    6.5
    D.
    65

  7. With rise in temperature, the solubility of ammonia in water at a fixed pressure

  8. A.
    increases
    B.
    decreases
    C.
    remains unchanged
    D.
    increases exponentially

  9. If the pH value of a solution changes by one unit, it implies that hydrogen ion concentration in the solution will change __________ times.

  10. A.
    10
    B.
    20
    C.
    70
    D.
    100

  11. The temperature at which a real gas obeys Boyle's law is termed as the

  12. A.
    triple point
    B.
    Boyle's temperature
    C.
    eutectic point
    D.
    inversion temperature

  13. Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the

  14. A.
    vapor follows the ideal gas law.
    B.
    molal latent heat of vaporisation is constant within the limited temperature range.
    C.
    volume in the liquid state is negligible compared with that in the vapor state.
    D.
    all (a), (b) & (c).

  15. Heat of neutralisation of HCl and NaOH is - 57.46 kJ/Kg mole. The heat of ionisation of water will be __________ kJ/Kg mole.

  16. A.
    57.46
    B.
    -57.46
    C.
    114.92
    D.
    -28.73

  17. A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately

  18. A.
    17
    B.
    20
    C.
    25
    D.
    34

  19. Othmer chart is useful in estimating the heat of

  20. A.
    mixing
    B.
    wetting
    C.
    adsorption
    D.
    none of these