BET apparatus is used to determine the ___________________?

Related Mcqs:

1. Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?

   A. Langmuir’s assumption applies to every adsorbed layer
   B. There is no dynamic equilibrium between successive layer
   C. The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer
   (except the first one) is involved in each of the evaporation process
   D. None of these

2. BET apparatus_______________________?

   A. Measures the catalyst surface area directly
   B. Operates at very high pressure
   C. Is made entirely of stainless steel
   D. None of these

3. B.E.T. method can be used to determine the ___________________ of a porous catalyst?

   A. Solid density
   B. Pore volume
   C. Surface area
   D. All A., B. and C.

4. Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes ?

   A. Strong pore diffusion control and mass transfer not controlling
   B. Both pore diffusion and mass transfer not controlling
   C. Both pore diffusion and mass transfer controlling
   D. Mass transfer controlling

5. Helium-mercury method can be used to determine the _____________ of the catalyst particle?

   A. Pore volume
   B. Solid density
   C. Porosity
   D. All A., B., & C.

6. The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of _______________ order?

   A. Zero
   B. First
   C. Second
   D. None of these

7. In an ideal P.F.R. at steady state conditions ___________________?

   A. The composition of reactants remains constant along a flow path
   B. The conversion of the reactant varies from point to point along a flow path
   C. There is no lateral mixing of fluid
   D. There may be diffusion along the flow path

8. Photo-chemical reactions occur in presence of ___________________?

   A. Sunlight
   B. Darkness
   C. Solid catalysts
   D. Monochromatic radiation only

9. The enzyme which can catalyse the conversion of glucose to ethyl alcohol is ___________________?

   A. Invertase
   B. Maltase
   C. Diastase
   D. Zymase

10. A catalyst is said to be a negative catalyst, if it ___________________?

    A. Retards the rate of reaction
    B. Reduces the value of equilibrium constant
    C. Does not initiate the reaction
    D. All A., B. and C.