chemical engineering chemical reaction MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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

21. The rate of a homogeneous reaction is a function of__________________?
0

A. Temperature and composition only

B. Pressure and composition only

C. Temperature and pressure only

D. All temperature, pressure and composition

22. For all positive reaction orders for a particular duty ?
0

A. Mixed reactor is always larger than the plug-flow reactor

B. Reactor size is independent of the type of flow

C. Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order

D. Density variation during reaction affects design

23. Unreacted core model represents the reaction involving ______________________?
0

A. None of these

B. Roasting of sulphide ores

C. Combustion of coal particles

D. Manufacture of carbon disulphide from elements

24. What is the dispersion number for a CSTR ?
0

A. ?

B. < 1

C. 0

D. 1

25. In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes ?
0

A. 2O3 ? 3O2

B. 2SO2 + O2 ? 2SO3

C. N2 + O2 ? 2NO

D. 2NO2 ? N2O4

26. For a _____________ order reaction, the units of rate constant and rate of reaction are the same ?
0

A. Second

B. Zero

C. First

D. Fractional

27. The rate of the reaction, X ? Y, quadruples when the concentration of X is doubled. The rate expression for the reaction is, r = K Cx n, the value of n in this case will be_______________________?
0

A. 2

B. 0

C. 1

D. 3

28. B.E.T. method can be used to determine the ___________________ of a porous catalyst?
0

A. Surface area

B. Pore volume

C. All A., B. and C.

D. Solid density

29. Chemical kinetics can predict the _______________ of a chemical reaction?
0

A. Rate

B. Feasibility

C. Both A. & B.

D. Neither A. nor B.

30. Variables affecting the rate of homogeneous reactions are___________________?
0

A. Pressure, temperature and composition

B. Pressure and composition only

C. Pressure and temperature only

D. Temperature and composition only

31. If n is the order of reaction, then unit of rate constant is _________________?
0

A. None of these

B. (Time)-1 (concentration)n 1

C. 1/(time)(concentration)n 1

D. (Time)n 1 (concentration)

32. For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single_______________?
0

A. CSTR of volume V/X

B. CSTR of volume V

C. PFR of volume V/X

D. PFR of volume V

33. A second order liquid phase reaction, A ? B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is_______________________?
0

A. d(VCA)/dt = -FCA kCA2V

B. d(VCA)/dt = FCAF kCA2V

C. d(VCA)/dt = F (CAF CA) kCA2V

D. d(VCA)/dt = -F (CAF CA) kCA2V

34. The reaction in which one of the products of reaction acts as a catalyst is called a/an ______________ reaction?
0

A. Autocatalytic

B. Catalytic

C. Photochemical

D. Biochemical

35. Differential method for analysing the kinetic data is used ___________________?
0

A. When the data are scattered

B. None of these

C. For testing complicated mechanisms

D. When rate expressions are very simple

36. In a CSTR _______________ varies with time ?
0

A. Reaction rate

B. Concentration

C. Both A. & B.

D. Neither A. nor B.

37. In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant)_____________________?
0

A. CA

B. CA2

C. CA3

D. CA4

38. Half life period of a chemical reaction is_________________?
0

A. Half of the space time of a reaction

B. The time required to reduce the concentration of the reacting substance to half its initial value

C. None of these

D. Half of the residence time of a reaction

39. The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an _______________ reaction?
0

A. Parallel

B. Elementary

C. Autokinetic

D. Non-elementary

40. Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is__________________?
0

A. atm.(hr)-1

B. (atm)-1

C. (hr)-1

D. (atm)-1.(hr)-1

Previous Next

Showing 21 to 40 of 472 mcqs