BET apparatus_______________________?

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 is used to determine the ___________________?

   A. Specific surface of a porous catalyst
   B. Pore size distribution
   C. Pore diameter
   D. Porosity of the catalyst bed

3. In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ?

   A. More than
   B. Less than
   C. Same as
   D. Data insufficient; can’t be predicted

4. Exposure of a photographic plate to produce a latent image is an example of _______________ reaction?

   A. Very slow
   B. Very fast
   C. Photochemical
   D. Both B. and C.

5. The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is___________________?

   A. 0.5
   B. -0.5
   C. 1
   D. 1.5

6. In autocatalytic reactions ?

   A. One of the reactants acts as a catalyst
   B. One of the products acts as a catalyst
   C. Catalysts have very high selectivity
   D. No catalyst is used

7. Half-life period for a first order reaction is _____________ the initial concentration of the reactant?

   A. Directly proportional to
   B. Inversely proportional to
   C. Independent of
   D. None of these

8. Thermodynamic equilibrium constant in a system is affected by___________________?

   A. Inerts
   B. Pressure
   C. Temperature
   D. All A., B. & C.

9. A reaction in which one of the products of reaction acts as a catalyst is called a/an ______________ reaction?

   A. Catalytic
   B. Autocatalytic
   C. Photochemical
   D. None of these

10. For high conversion in a highly exothermic solid catalysed reaction, use a ______________ bed reactor?

    A. Fixed
    B. Fluidised bed reactor followed by a fixed
    C. Fixed bed reactor followed by a fluidised
    D. Fluidised