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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1.
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is___________________?

More

Less

Same

Either A. or B., depends on other factors

2.
In a zero order reaction, reactants concentration does not change with time and the_________________?

Time for half change is half the time taken for completion of the reaction

Time for half change is independent of the initial concentration

Time for completion of the reaction is independent of the initial concentration

Reaction rate is trebled when the initial concentration is trebled

3.
Variables affecting the rate of homogeneous reactions are___________________?

Pressure and temperature only

Temperature and composition only

Pressure and composition only

Pressure, temperature and composition

4.
If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the ________________ diffusion?

Film

Ash layer

Pore

None of these

5.
The half life period ‘t’ of a zero order reaction as shown in the bellow figure, is equal to_________________?

CA0/2K

CA0/K

0.693/K

1/K

6.
Semibatch reactor is preferred, when a/an__________________?

A highly exothermic reaction is to be controlled

Undesirable side reaction (at high concentration of one of the reactants) is to be avoided

A gas is to be reacted with liquid (e.g. hydrogenation of fat)

All A., B., and C.

7.
In an exothermic reaction, the energy of the reacting substances as compared to that of products is____________________?

More

Less

Same

Either A. or B., depends on order of reaction

8.
B.E.T. method can be used to determine the ___________________ of a porous catalyst?

Solid density

Pore volume

Surface area

All A., B. and C.

9.
On application of pressure to the equilibrium system, ice ⇌ water; which of the following phenomenon will occur ?

Water will evaporate

Equilibrium will not be attained

More ice will be formed

More water will be formed

10.
Rate of a chemical reaction is not affected by the____________________?

Catalyst

Temperature

Reactant’s concentration

Number of molecules of reactants taking part in the reaction

11.
Batch process is preferred over continuous process, when the___________________?

Product yields and quality cannot be achieved in continuous process, because of long

Idence time

Sales demand of product is not steady

Same equipment cannot be used for several processes of the same nature

12.
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the____________________?

Catalyst size is reduced or the catalyst diffusivity is reduced

Catalyst size is reduced or the catalyst diffusivity is increased

Catalyst size is increased or the catalyst diffusivity is reduced

Catalyst size is increased or the catalyst diffusivity is increased

13.
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_______________________?

D(VCA)/dt = -F (CAF – CA) – kCA2V

D(VCA)/dt = F (CAF – CA) – kCA2V

D(VCA)/dt = -FCA – kCA2V

D(VCA)/dt = FCAF – kCA2V

14.
Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes ?

Strong pore diffusion control and mass transfer not controlling

Both pore diffusion and mass transfer not controlling

Both pore diffusion and mass transfer controlling

Mass transfer controlling

15.
The equilibrium constant of a catalytic chemical reaction _______________ due to the presence of?

Atalyst.

Increases

Decreases

Remain unaffected

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