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Chemical Engineering :: Stoichiometry

  1. In physical adsorption, as compared to chemisorption, the

  2. A.

     Quantity adsorbed per unit mass is higher

    B.

     Rate of adsorption is controlled by the resistance to surface reaction

    C.

     Activation energy is very high

    D.

     Heat of adsorption is very large


  3. Pick out the wrong unit conversion of calorific value.

  4. A.

     1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg

    B.

     1 BTU/ft³ = 8.9 kcal/m³ = 0.038 MJ/m³

    C.

     1 BTU/lb = 2.3 kcal/kg

    D.

     1 kcal/m³ = 0.1124 BTU/ft³


  5. What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C?

  6. A.

     2/3

    B.

     1/3

    C.

     1/2

    D.

     L/3 x 298/273


  7. For any system, the __________ heat of solution is dependent on the temperature and the adsorbate concentration.

  8. A.

     Integral

    B.

     Differential

    C.

     Both A & B

    D.

     Neither A nor B


  9. The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state.

  10. A.

     Less

    B.

     More

    C.

     Same

    D.

     Either A or B; depends on the nature of the substance


  11. If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will

  12. A.

     Remain unaltered

    B.

     Increase nine fold

    C.

     Increase three fold

    D.

     Decrease three fold


  13. For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.

  14. A.

     Sodium chloride

    B.

     Sodium carbonate monohydrate

    C.

     Anhydrous sodium sulphate

    D.

     Hypo


  15. Dry air is a mixture of

  16. A.

     Vapors

    B.

     Gases

    C.

     Both A & B

    D.

     Neither A nor B


  17. The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the

  18. A.

     Relative humidity

    B.

     Relative saturation

    C.

     Percentage saturation

    D.

     None of these


  19. Internal energy is independent of the __________ for an ideal gas.

  20. A.

     Pressure

    B.

     Volume

    C.

     Both A & B

    D.

     Neither A nor B