Chemical Reaction Engineering MCQs

Question 1

Equilibrium of a chemical reaction as viewed by kinetics is a __________ state.

Accepted Answer

Dynamic steady

Answer

Static steady

Answer

Dynamic unsteady

Answer

None of these

Question 2

Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?

Accepted Answer

Film diffusion

Answer

Pore diffusion

Answer

Ash layer diffusion

Answer

Chemical reaction

Question 3

A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are

Accepted Answer

Equal in size

Answer

Of different sizes

Answer

Of such size that the ratio of their volumes is < 5

Answer

None of these

Question 4

Pick out the correct statement.

Accepted Answer

Pressure changes do not change the equilibrium concentrations

Answer

A catalyst speeds up the forward reaction but slows shown the reverse reaction

Answer

Addition of catalyst changes the equilibrium constant

Answer

The composition of equilibrium is changed by catalyst

Question 5

For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of

Accepted Answer

Dead zone

Answer

Ideal plug flow

Answer

Bypass

Answer

Chanelling

Question 6

The increase in the rate of reaction with temperature is due to

Accepted Answer

Decrease in activation energy

Answer

Increase in the number of effective collisions

Answer

Increase in the average kinetic energy of the reacting molecules

Answer

None of these

Question 7

In a chemical reaction, __________ are conserved.

Accepted Answer

Both B & C

Answer

Ions

Answer

Masses

Answer

Atoms

Question 8

With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)

Accepted Answer

Increases

Answer

Decreases

Answer

Remains same

Answer

Increases linearly

Question 9

If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is

Accepted Answer

One

Answer

Zero

Answer

Two

Answer

Three