Chemical Reaction Engineering MCQs

Question 1

The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called

Accepted Answer

Fungi

Answer

A ferment or an enzyme

Answer

Haemoglobin

Answer

None of these

Question 2

'Unreacted core model' represents the reaction involving

Accepted Answer

Roasting of sulphide ores

Answer

Combustion of coal particles

Answer

Manufacture of carbon disulphide from elements

Answer

None of these

Question 3

If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to

Accepted Answer

$$\frac{{{{	ext{E}}_{	ext{D}}}}}{2}$$

Answer

The intrinsic activation energy E

Answer

E + ED where ED is activation due to diffusion

Answer

$$\frac{{{	ext{E}} + {{	ext{E}}_{	ext{D}}}}}{2}$$

Question 4

Pick out the wrong statement.

Accepted Answer

In general, the rate of a reaction becomes triple for every 10°C rise in temperature

Answer

In a multistep reaction, the slowest step is the rate determining step

Answer

Slow chemical reactions have generally high values of activation energy

Answer

Molecularity of a reaction can not be zero but the order of a reaction can be zero

Question 5

Half life period of a chemical reaction is

Accepted Answer

The time required to reduce the concentration of the reacting substance to half its initial value

Answer

Half of the space time of a reaction

Answer

Half of the residence time of a reaction

Answer

None of these

Question 6

Fluid flow in a real packed bed can be approximated as __________ model.

Accepted Answer

Dispersion

Answer

Plug flow

Answer

Mixed flow

Answer

Tank in series

Question 7

Participation of __________ is involved in the occurrence of a chemical reaction.

Accepted Answer

Electrons

Answer

Protons

Answer

Neutrons

Answer

None of these

Question 8

With decrease in temperature, the equilibrium conversion of a reversible endother- mic reaction

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unaffected

Answer

Increases linearly with temperature

Question 9

'n' number of plug flow reactors (P.F.R) in series with a total volume 'V' gives the same conversion as one P.F.R. of volume

Accepted Answer

V

Answer

$$\frac{{	ext{V}}}{{	ext{n}}}$$

Answer

V.n

Answer

$$\frac{1}{{	ext{V}}}$$