Chemical Reaction Engineering MCQs

Question 1

An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is

Accepted Answer

Maximum at the inlet of the reactor

Answer

Maximum at the exit of the reactor

Answer

Maximum at the centre of the reactor

Answer

Constant throughout the reactor

Question 2

In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a __________ reaction.

Accepted Answer

Catalytic homogenous

Answer

Non-catalytic homogeneous

Answer

Non-catalytic heterogeneous

Answer

Catalytic heterogeneous

Question 3

For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to Cxn, then what is the value of 'n'?

Accepted Answer

4

Answer

$$\frac{1}{4}$$

Answer

16

Answer

2

Question 4

Pick out the wrong statement.

Accepted Answer

The order and molecularity of a complex reaction may not be the same

Answer

Visible radiation provides the necessary activation energy in photochemical reactions

Answer

For a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k)

Answer

Molecularity of the reaction is always a whole number greater than zero

Question 5

Which of the following is not a theory of homogeneous reaction?

Accepted Answer

None of these

Answer

Collision theory and activated complex theory

Answer

Chain reaction theory

Answer

Radiation hypothesis

Question 6

Rate of an autocatalytic chemical reaction is a function of

Accepted Answer

All of the above

Answer

Temperature only

Answer

Pressure only

Answer

Composition only

Question 7

The role of a catalyst in a chemical reaction is to change the

Accepted Answer

Activation energy

Answer

Equilibrium constant

Answer

Final products

Answer

Heat of reaction

Question 8

Pick out the correct statement.

Accepted Answer

The rate constant for a first order reaction does not change on changing the concentration units

Answer

A chemical reaction accompanied by absorption of heat is called an exothermic reaction

Answer

A chemical reaction accompanied by evolution of heat is called an endother-mic reaction

Answer

Chemical equilibrium state is dynamic in nature

Question 9

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.

Accepted Answer

16

Answer

4

Answer

8

Answer

12