Chemical Reaction Engineering Objective Type questions - ObjectiveBooks

Chemical Reaction Engineering Objective Type questions

Practice Test: Question Set - 34

1. The rate of forward reaction, at chemical equilibrium is _________the rate of backward reaction.
    (A) More than
    (B) Less than
    (C) Equal to
    (D) Either (b) or (c)

2. The rate constant of a first order reaction depends on the
    (A) Concentration of the reactant
    (B) Temperature
    (C) Concentration of the product
    (D) Time

3. An exothermic reaction takes place in an adiabatic reactor. The product temperature __________ reactor feed temperature.
    (A) Is always equal to
    (B) Is always greater than
    (C) Is always less than
    (D) May be greater or less than

4. The units of frequency factor in Arrhenius equation
    (A) Are the same as those of the rate constant
    (B) Depend on the order of the reaction
    (C) Depend on temperature, pressure etc. of the reaction
    (D) Are cycles per unit time

5. Which of the following is the most suitable for isothermal operation?
    (A) Batch reactor
    (B) Back-mix reactor
    (C) Plug-flow reactor
    (D) Fixed bed reactor

6. Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is:
    (A) 0
    (B) 1
    (C) 2
    (D) 3

7. The rate at which a chemical substance reacts is proportional to its
    (A) Active mass
    (B) Molecular weight
    (C) Equivalent weight
    (D) Atomic weight

8. A catalyst in a chemical reaction __________ free energy change in the reaction.
    (A) Increases
    (B) Decreases
    (C) Either (a) or (b); depends on the type of catalyst
    (D) Neither (a) nor (b)

9. Sum of the powers of the concentration terms in the rate equation is called the __________ of the reaction.
    (A) Order
    (B) Overall order
    (C) Molecularity
    (D) None of these

10. The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is:
    (B) 0
    (C) 1
    (D) > 1

11. Thermodynamic equilibrium constant in a system is affected by
    (A) Inerts
    (B) Pressure
    (C) Temperature
    (D) All (a), (b) & (c)

12. In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.
    (A) Catalytic
    (B) Parallel
    (C) Series
    (D) Auto catalytic

13. Considering the endothermic dissociation of CaCO3 in a closed vessel (CaCO3  CaO + CO2), the pressure of CO2 increases, if
    (A) A catalyst is added
    (B) The temperature is increased
    (C) An inert gas is pumped keeping the temperature constant
    (D) None of these

14. The catalytic activity of enzymes is due to their capacity to lower the __________ energy.
    (A) Activation
    (B) Potential
    (C) Kinetic
    (D) None of these

15. Carrier in a catalyst increases its
    (A) Surface area
    (B) Activity
    (C) Performance
    (D) None of these

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