Chemical Reaction Mcqs
This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Chemical Reaction ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Chemical Reaction comprehensively.
32. Limiting reactant in a chemical reaction decides the____________________?
Rate constant
Conversion
Reaction speed
Equilibrium constant
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33. The exit age distribution curve E(t) for an ideal CSTR with the average residence time, η, is given by__________________?
E-t/η
E-t/η/η
1 – e-t/η
1 – (e-t/η/η)
34. What is the value of ‘n’ if the reaction rate of the chemical reaction A → B, is proportional to CA n and it is found that the reaction rate triples, when the concentration of ‘A’ is increased 9 times ?
1/2
1/3
1/9
3
35. For all positive reaction orders for a particular duty ?
Mixed reactor is always larger than the plug-flow reactor
Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order
Reactor size is independent of the type of flow
Density variation during reaction affects design
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36. In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes ?
2O3 ⇌ 3O2
N2 + O2 ⇌ 2NO
2NO2 ⇌ N2O4
2SO2 + O2 ⇌ 2SO3
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37. Non-catalytic fluid-solid reactions are represented by _______________ model?
Continuous reaction
Unreacted core
Both A. and B.
Neither A. and B.
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38. Which of the following holds good for an elementary reaction as shown in the bellow figure ?
The rate of disappearance of ‘Y’ is equal to the rate of appearance of ‘Z’
The rate of disappearance of ‘Y’ is equal to the rate of disappearance of ‘X’
Three times the rate of disappearance of ‘X’ is equal to the rate of appearance of ‘Z’
The rate of disappearance of ‘X’ is equal to the rate of appearance of ‘Z’
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39. The exit age distribution of fluid leaving a vessel is used to know the__________________?
Activation energies of a reaction
Reaction mechanism
Extent of non-ideal flow in the vessel
None of these
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40. The equilibrium constant ‘K’ of a chemical reaction depends on_________________?
Temperature only
Pressure only
Temperature and pressure
Ratio of reactants
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41. With increase in temperature, the rate constant obeying Arrhenius equation____________________?
Increases
Decreases
Decreases exponentially
Can either increase or decrease, depends on the frequency factor
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42. For a homogeneous reaction of nth order, the dimension of the rate constant is given by_________________?
1/(time)n
(Concentration)1 – n/(time)
(Concentration)n – 1/(time)
None of these
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43. A catalyst promoter_________________?
Improves the activity of a catalyst
Acts as a catalyst support
Itself has very high activity
All A., B. and C.
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44. The vessel dispersion number (D/μL) for plug flow is_________________?
0
500
750
45. The rate constant of a reaction is a function of the ___________________?
Time of reaction
Temperature of the system
Extent of reaction
Initial concentration of the reactants
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