Chemical Reaction Engineering Book Multiple Choice Questions - Set 10 - ObjectiveBooks

Chemical Reaction Engineering Book Multiple Choice Questions - Set 10

Practice Test: Question Set - 10

1. Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
    (A) Pore diffusion
    (B) Gas film
    (C) Chemical reaction
    (D) None of these

2. For the reversible reaction A  2B, if the equilibrium constant K is 0.05 mole/liter; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium?
    (A) 0.253
    (B) 0.338
    (C) 0.152
    (D) 0.637

3. 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

4. The extent of a reaction is
    (A) Different for reactants and products
    (B) Dimensionless
    (C) Depends on the stoichiometric co-efficient
    (D) All of the above

5. A rise in temperature
    (A) Normally tends to increase the reaction rate
    (B) Does not affect a catalyzed reaction
    (C) Does not affect photo-chemical reaction rates
    (D) All (a), (b) and (c)

6. Arrhenius equation represents graphically the variation between the __________ and temperature.
    (A) Rate of reaction
    (B) Frequency factor
    (C) Rate constant
    (D) Activation energy

7. Pick out the wrong statement.
    (A) A catalyst does not alter the final position of equilibrium in a reversible reaction
    (B) A catalyst initiates a reaction
    (C) A catalyst is specific in reaction
    (D) A catalyst remains unchanged in chemical composition at the end the reaction

8. For a heterogenous 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

9. Pick out the wrong statement.
    (A) In a first order reaction, A → products; the reaction becomes slower as it proceeds, because the concentration of A decreases and the rate is proportional to the concentration of A
    (B) Transition state theory approaches the problem of calculating reaction rates by concentrating on the idea of activated complexes
    (C) According to the penetration theory, the mass transfer co-efficient decreases, if the exposure time of an eddy to the solute decreases
    (D) If the rate of an irreversible reaction, A + B  2C is k.CA.CB, then the reaction is always elementary

10. 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

11. If 'n' is the order of reaction, then unit of rate constant is
    (A) 1/(time)(concentration)n - 1
    (B) (Time)-1 (concentration)n - 1
    (C) (Time)n - 1 (concentration)
    (D) None of these

12. Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes.
    (A) 18
    (B) 24
    (C) 6
    (D) 12

13. Kinetics of a solid catalyzed reaction can best be studied in a __________ reactor.
    (A) Batch
    (B) Plug-flow
    (C) Mixed
    (D) None of these

14. For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of:
    (A) Ideal plug flow
    (B) Bypass
    (C) Dead zone
    (D) Chanelling

15. For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.
    (A) τ and θ are always equal
    (B) τ = θ, when the fluid density changes in the reactor
    (C) τ = θ, for an isothermic tubular reactor in which the density of the process fluid is constant
    (D) τ = θ, for a non-isothermal reactor

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