Elements of Chemical Reaction Competitive Exam Test Paper - Set 19 - ObjectiveBooks

Elements of Chemical Reaction Competitive Exam Test Paper - Set 19

Practice Test: Question Set - 19

1. Helium-mercury method can be used to determine the __________ of the catalyst particle.
    (A) Pore volume
    (B) Solid density
    (C) Porosity
    (D) All (a), (b), & (c)

2. In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2, the yield of B increases with the
    (A) Increase of temperature
    (B) Decrease of temperature
    (C) Increase in initial concentration of A
    (D) Decrease in initial concentration of A

3. Collision theory gives the rate constant for bimolecular reaction as
    (A) K α √T.e-E/RT
    (B) K α eE/RT
    (C) K α e-E/RT
    (D) None of these

4. Pick out the wrong statement.
    (A) Catalytic activity of enzyme catalyzed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C
    (B) Most of the enzyme catalyzed reactions involve at least two substrates
    (C) Enzymes help in increasing the activation energy of the reaction
    (D) Equilibrium concentrations in enzyme catalyzed reactions can be calculated by using the thermodynamic properties of substrates & products

5. What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?
    (A) 0
    (B) 1
    (C) 2
    (D) 3

6. The increase in the rate of reaction with temperature is due to
    (A) Increase in the number of effective collisions
    (B) Decrease in activation energy
    (C) Increase in the average kinetic energy of the reacting molecules
    (D) None of these

7. Consider a reversible exothermic reaction in a plug flow reactor. The maximum and minimum permissible temperatures are Tmax and Tmin respectively. Which of the following temperature (T) profiles will require the shortest residence time to achieve the desired conversion.

8. Which of the following is a characteristic of an ideal plug flow reactor?
    (A) Axial dispersion
    (B) Flat velocity profile
    (C) Uniform mixing
    (D) None of these

9. A back mix reactor is
    (A) Suitable for gas phase reactions
    (B) Ideal at very low conversion
    (C) Same as plug flow reactor (PFR)
    (D) Same as ideal stirred tank reactor

10. For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction.
    (A) XA = k . t
    (B) [CA0/(1 + εA XA)] (dXA/dt) = k
    (C) -ln(1 - XA) = kt
    (D) εA . ln (1 - XA) = k . t

11. Rate constant 'k' and absolute temperature 'T' are related by collision theory (for bimolecular) as
    (A) k  T1.5
    (B) k  exp(-E/RT)
    (C) k  √T
    (D) k  T

12. If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is:
    (A) Zero
    (B) One
    (C) Two
    (D) Three

13. The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to
    (A) m
    (B) 1/m
    (C) √m
    (D) m2

14. The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.
    (A) Activation
    (B) Potential
    (C) Binding
    (D) Threshold

15. The following half life data are available for the irreversible liquid phase reaction A → products. The overall order of reaction is:
    (A) 0.5
    (B) 1
    (C) 1.5
    (D) 2

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