Chemical Reaction Engineering MCQs

Question 1

According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction

Accepted Answer

$${	ext{K}} \propto {{	ext{e}}^{ - \frac{{	ext{E}}}{{{	ext{Rt}}}}}}$$

Answer

$${	ext{K}} \propto \sqrt {	ext{T}} $$

Answer

$${	ext{K}} \propto {	ext{T}}{{	ext{e}}^{ - \frac{{	ext{E}}}{{{	ext{Rt}}}}}}$$

Answer

None of these

Question 2

Collision theory gives the rate constant for bimolecular reaction as

Accepted Answer

$${	ext{K}}\alpha\, {{	ext{e}}^{ - \frac{{	ext{E}}}{{{	ext{RT}}}}}}$$

Answer

$${	ext{K}}\alpha \sqrt {	ext{T}} .{{	ext{e}}^{ - \frac{{	ext{E}}}{{{	ext{RT}}}}}}$$

Answer

$${	ext{K}}\alpha\, {{	ext{e}}^{\frac{{	ext{E}}}{{{	ext{RT}}}}}}$$

Answer

None of these

Question 3

The vessel dispersion number (D/μL) for plug flow is

Accepted Answer

0

Answer

500

Answer

750

Answer

∞

Question 4

Enzymes are destroyed, when the

Accepted Answer

Temperature is very high

Answer

Reactant's concentration is very high

Answer

Reactant's concentration is very low

Answer

Reaction rate is independent of the reactant's concentration

Question 5

A catalyst is said to be a negative catalyst, ifit

Accepted Answer

Retards the rate of reaction

Answer

Reduces the value of equilibrium constant

Answer

Does not initiate the reaction

Answer

All of the above

Question 6

For a zero order chemical reaction, the

Accepted Answer

All of the above

Answer

Half life period is directly proportion to the initial concentration of the reac-tants

Answer

Plot of products concentration with time is a straight line through the origin

Answer

Products concentration increases linerarly with time

Question 7

The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.

Accepted Answer

Remains unaffected

Answer

Increases

Answer

Decreases

Answer

Unpredictable from the data

Question 8

From Arhenius law, a plot of loge K versus $$\frac{1}{{	ext{T}}}$$ gives a straight line with a slope of $$\left( { - \frac{{	ext{E}}}{{	ext{R}}}} ight)$$ . The unit of $$\frac{{	ext{E}}}{{	ext{R}}}$$ is

Accepted Answer

°K

Answer

K cal

Answer

K cal/°K

Answer

K cal. °K

Question 9

Which of the following factors control the deactivation of a porous catalyst pellet?

Accepted Answer

All of the above

Answer

Decay reactions

Answer

Pore diffusion

Answer

Form of surface attack by poison