The value of Steric factor ‘P’ in the equation k = PZeE/RT usually ranges from ______________________?

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. The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an _______________ reaction?

   A. Elementary
   B. Non-elementary
   C. Parallel
   D. Autokinetic

3. The unit of frequency factor in Arrhenius equation is_______________?

   A. Same as that of rate constant
   B. Same as that of activation energy
   C. Dimensionless
   D. None of these

4. For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the____________________?

   A. Catalyst size is reduced or the catalyst diffusivity is reduced
   B. Catalyst size is reduced or the catalyst diffusivity is increased
   C. Catalyst size is increased or the catalyst diffusivity is reduced
   D. Catalyst size is increased or the catalyst diffusivity is increased

5. In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant)_____________________?

   A. CA
   B. CA2
   C. CA3
   D. CA4

6. Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________?

   A. tan hT/T
   B. tan T/T
   C. tan hT/tan T
   D. None of these

7. What is the order of a chemical reaction of the bellow figure, if the rate of formation of ‘C’, increases by a factor of 2.82 on doubling the concentration of ‘A’ and increases by a factor of 9 on trebling the concentration of ‘B’ ?

   A. 7/2
   B. 7/4
   C. 5/2
   D. 5/4

8. The rate equation for the reaction represented by as shown in the bellow figure, is given by – rx = K1 . Cx/(1 + K2 Cx). At high value of Cx (i.e.., K2Cx > > 1), the order of the reaction and the rate constant are respectively___________________?

   A. Zero order & K1/K2
   B. Zero order & K1
   C. First order & K1
   D. First order & K1/K2

9. The value of ‘n’ for a chemical reaction A → B, whose reaction rate is → CA n, will be _______________ if the rate of the reaction increases by a factor of 8, when the concentration of is doubled?

   A. 0
   B. 1
   C. 2
   D. 3

10. The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?

    A. L √(K/D1)
    B. 1/[L√(K/D1)]
    C. 1
    D. ∞