The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between___________________?

Related Mcqs:

1. . In the converter of the contact process for the manufacture of H2SO4 the equilibrium conversion of SO2__________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO2 to air?

   A. (i) increases (ii) decreases
   B. (i) decreases (ii) increases
   C. (i) increases (ii) increases
   D. (i) decreases (ii) decreases

2. If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chatelier’s principle)?

   A. Decreases
   B. Increases
   C. Remains unaltered
   D. Changes unpredictably

3. During manufacture of H2SO4, the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the _____________________?

   A. Temperature is increased
   B. Pressure is reduced
   C. Temperature is increased and pressure is reduced
   D. Temperature is reduced and pressure is increased

4. In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a ______________ reaction ?

   A. Non-catalytic homogeneous
   B. Non-catalytic heterogeneous
   C. Catalytic homogenous
   D. Catalytic heterogeneous

5. Three plug flow reactors (PFR’s) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be ______________ tons/hr ?

   A. 100
   B. 150
   C. 200
   D. 225

6. Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the ___________________?

   A. Activation energy
   B. Equilibrium constant
   C. Heat of reaction
   D. None of these

7. For a heterogeneous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate – rA0 is invariant with total pressure. The rate controlling step is______________________?

   A. Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
   B. Surface reaction between absorbed A and absorbed B
   C. Surface reaction between A in the gas phase and absorbed B
   D. Desorption of C

8. For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the _______________ is the controlling resistance?

   A. Film diffusion
   B. Diffusion through ash layer
   C. Chemical reaction
   D. Either A., B. or C.

9. For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?

   A. Film diffusion
   B. Diffusion through ash layer
   C. Chemical reaction
   D. Either A., B. or C.

10. Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?

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