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.

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31.
Which of the following fixes the volume of a batch reactor for a particular conversion and production rate ?

Operating conditions (e.g. pressure and temperature)

Rate constant

Density of mixture

None of these

32.
Limiting reactant in a chemical reaction decides the____________________?

Rate constant

Conversion

Reaction speed

Equilibrium constant

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

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

37.
Non-catalytic fluid-solid reactions are represented by _______________ model?

Continuous reaction

Unreacted core

Both A. and B.

Neither A. and B.

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’

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

40.
The equilibrium constant ‘K’ of a chemical reaction depends on_________________?

Temperature only

Pressure only

Temperature and pressure

Ratio of reactants

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

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

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.

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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