Chemical Reaction Engineering MCQs

Question 1

Signal normally used to study non-ideal flow by stimulus response technique is __________ input.

Accepted Answer

Both A & B

Answer

Pulse

Answer

Step

Answer

Neither A nor B

Question 2

If in the gaseous phase reaction, N2O4 ⇋ 2NO2, x is the part of N2O4 which dissociates, then the number of molecules at equilibrium will be

Accepted Answer

(1 + x)

Answer

(1 - x)

Answer

(1 + x)2

Answer

(1 - x)2

Question 3

Kinetics of a catalytic reaction can be best studied on a/an __________ reactor.

Accepted Answer

Either A, B and C

Answer

Mixed

Answer

Integral (plug flow)

Answer

Differential (flow)

Question 4

Fluidised bed reactor is characterised by

Accepted Answer

Uniformity of temperature

Answer

Comparatively smaller equipment

Answer

Very small pressure drop

Answer

Absence of continuous catalyst regeneration facility

Question 5

At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?

Accepted Answer

2.5

Answer

1.6

Answer

2

Answer

2.24

Question 6

If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is

Accepted Answer

Very much feasible

Answer

Not feasible

Answer

Just feasible

Answer

Unpredictable as ΔG is no measure of feasibility of a reaction

Question 7

Transition state theory relates the above quantities as

Accepted Answer

$${	ext{K}} \propto {	ext{T}}.{{	ext{e}}^{\frac{{	ext{E}}}{{{	ext{RT}}}}}}$$

Answer

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

Answer

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

Answer

$${	ext{K}} \propto {{	ext{T}}^{1.5}}$$

Question 8

Velocity of a chemical reaction

Accepted Answer

None of these

Answer

Decreases with increase in temperature

Answer

Increases with increase of pressure of reactants for all reactions

Answer

Decreases with increase of reactant concentration

Question 9

Which of the following will favour the reverse reaction in a chemical equilibrium reaction?

Accepted Answer

Increasing the concentration of one or more of the products

Answer

Increasing the concentration of one of the reactants

Answer

Removal of at least one of the products at regular interval

Answer

None of these