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chemical engineering chemical reaction MCQs

Practise multiple-choice questions from chemical engineering chemical reaction for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical reaction Mcqs

1. For identical flow rate, feed composition and for elementary first order reactions, N equal sized mixed reactors in series with a total volume V gives the same conversion as a single plug flow reactor of volume V for constant density systems. This is true, when the value of N is ___________________?
0

A. ? 1

B. ?

C. > 1

D. 1

2. Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually ________________ the concentration of catalyst, if it does not entail a chain mechanism?
0

A. Proportional to the square of

B. Proportional to

C. Inversely proportional to

D. Independent of

3. Bulk diffusion in catalyst pore _______________ with increase in pressure?
0

A. Increases exponentially

B. Remains unchanged

C. Decreases

D. Increases

4. The equilibrium constant K of a chemical reaction depends on_________________?
0

A. Pressure only

B. Temperature and pressure

C. Ratio of reactants

D. Temperature only

5. Autocatalytic reactions are best carried out in a_________________?
0

A. Plug flow reactor

B. Recycle reactor

C. CSTR in series

D. CSTR

6. Velocity of a chemical reaction___________________?
0

A. Decreases with increase of reactant concentration

B. Increases with increase of pressure of reactants for all reactions

C. None of these

D. Decreases with increase in temperature

7. When a catalyst increases the rate of chemical reaction, the rate constant_____________________?
0

A. Become infinite

B. Remain constant

C. Increases

D. Decreases

8. Arrhenius equation shows the variation of ___________________ with temperature?
0

A. Reaction rate

B. Rate constant

C. Frequency factor

D. Energy of activation

9. The reaction between oxygen and organic material is a/an _____________ reaction?
0

A. Endothermic

B. Photochemical

C. Exothermic

D. Biochemical

10. A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be ____________________ minutes?
0

A. 4

B. 12

C. 16

D. 8

11. The half life period t of a zero order reaction as shown in the bellow figure, is equal to_________________?
0

A. 0.693/K

B. CA0/2K

C. CA0/K

D. 1/K

12. Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of _______________ order?
0

A. Third

B. First

C. Second

D. Zero

13. Which of the following will give maximum gas conversion ?
0

A. Semi-fluidised bed reactor

B. Fixed bed reactor

C. Plug-flow catalytic reactor

D. Fluidised bed reactor

14. Promoter is added to the catalyst to improve its____________________?
0

A. Surface area

B. None of these

C. Porosity

D. Sensitivity

15. In case of calcination of limestone, CaCO3 CaO + CO2, the addition of more of CaO will result in _______________ in the concentration of CO2?
0

A. Increase

B. No change

C. Unpredictable from the data

D. Decrease

16. On application of pressure to the equilibrium system, ice ? water; which of the following phenomenon will occur ?
0

A. More water will be formed

B. More ice will be formed

C. Water will evaporate

D. Equilibrium will not be attained

17. 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 ?
0

A. 0

B. 2

C. 3

D. 1

18. A space velocity of 5 hr-1 means that ___________________?
0

A. Cent per cent conversion can be achieved in at least 5 hours

B. Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour

C. After every 5 hours, reactor is being filled with the feed

D. A fixed conversion of a given batch of feed takes 5 hours

19. For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant ?
0

A. Increases with pressure

B. Increases /decreases with pressure depending on the stoichiometric co-efficients of the

C. Decreases with pressure

D. ction

E. Is independent of pressure

20. Rate of a chemical reaction is independent of the concentration of the reactants for a _________________ reaction?
0

A. None of these

B. Zero order

C. Consecutive

D. Third order

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