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Chemical Engineering :: Stoichiometry

  1. Addition of a non-volatile solute to a pure solvent

  2. A.
    increases its freezing point.
    B.
    increases its boiling point.
    C.
    decreases its freezing point.
    D.
    both (b) and (c)

  3. The depression in freezing point of a solution is

  4. A.
    inversely proportional to the mass of solvent.
    B.
    directly proportional to the mole of solute.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

  5. For the gaseous phase reaction, N2 + O22NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by

  6. A.
    increasing the concentration of N2.
    B.
    decrease in temperature.
    C.
    increase in pressure.
    D.
    decrease in pressure.

  7. Pick out the correct statement.

  8. A.
    Heat of solution is always positive.
    B.
    At equilibrium, ΔG is zero.
    C.
    For the reaction, PCl5PCl3 + Cl2, ΔG is less than ΔE
    D.
    The heating of water in a beaker is an example of an isolated system.

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

  10. A.
    independent of temperature.
    B.
    increases with rise in pressure.
    C.
    increased with decrease in pressure.
    D.
    unchanged with pressure changes.

  11. 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

  12. A.
    1.72
    B.
    0.58
    C.
    0.5
    D.
    0.2

  13. Pick out the correct statement.

  14. A.
    A substance existing above its critical temperature is called a saturated vapor.
    B.
    A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is more than the partial pressure of the vapor at the same temperature.
    C.
    Heat added to or given up by a substance at constant temperature is called the sensible heat.
    D.
    The end points of a vapor-pressure vs. temperature curve are critical and triple points.

  15. Normality of a solution does not change with the increase in the

  16. A.
    pressure
    B.
    temperature
    C.
    solute concentration
    D.
    dilution of the solution

  17. In a binary liquid system, the composition expressed as __________ is independent of the temperature & pressure.

  18. A.
    kg of solute/kg of solvent
    B.
    kg-mole of solute/kg-mole of solvent
    C.
    kg-mole of solute/1000 kg of solvent
    D.
    all (a), (b) & (c)

  19. A sugar solution containing __________ percent sugar is equivalent to 1 Brix.

  20. A.
    0.01
    B.
    0.1
    C.
    1
    D.
    10