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Chemical Engineering :: Stoichiometry

  1. The elevation in boiling point of a solution is proportional to the __________ of the solution.

  2. A.
    molal concentration
    B.
    reciprocal of the molal concentration
    C.
    normality
    D.
    molarity

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  3. Pick out the wrong statement.

  4. A.
    One kg-mole of an ideal gas occupies 22.4 m3 at N.T.P.
    B.
    One lb-mole of an ideal gas occupies 359 ft3 at N.T.P.
    C.
    One gm-mole of an ideal gas occupies 22.4 litres (i.e., 22400 c.c) at N.T.P.
    D.
    Density of dry air at N.T.P. is 1 gm/litre.

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  5. 1 Pascal (unit of pressure) is equal to __________ N/m2.

  6. A.
    10
    B.
    1
    C.
    0.1
    D.
    1000

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  7. 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is

  8. A.
    1/2
    B.
    1/3
    C.
    1/4
    D.
    2/3

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  9. A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is

  10. A.
    13728 J
    B.
    19206 J
    C.
    4576 J
    D.
    12712 J

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  11. An oxidation process is accompanied by decrease in the

  12. A.
    number of electrons.
    B.
    oxidation number.
    C.
    number of ions.
    D.
    all (a), (b) & (c).

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  13. Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

  14. A.
    heat conservation.
    B.
    yield enhancement.
    C.
    product enrichment.
    D.
    none of these.

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  15. Which of the following expressions defines the Baume gravity scale for liquids heavier than water ?

  16. A.
    (141.5/G) - 131.5
    B.
    145 - (145/G)
    C.
    200(G-1)
    D.
    (400/G) - 400

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  17. One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 → CO2 + 2H2O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about

  18. A.
    0.19
    B.
    0.33
    C.
    0.40
    D.
    0.67

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  19. Volume percent for gases is equal to the

  20. A.
    weight percent.
    B.
    mole percent.
    C.
    weight percent only for ideal gases.
    D.
    mole percent only for ideal gases.

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