Chemical Reaction Engineering MCQs

Question 1

The excess energy of the reactants required to dissociate into products is known as the __________ energy.

Accepted Answer

Activation

Answer

Thermal

Answer

Threshold

Answer

Binding

Question 2

Radioactive decay follows __________ order kinetics.

Accepted Answer

First

Answer

Second

Answer

Third

Answer

Zero

Question 3

__________ is the response curve for a step input signal from a reactor.

Accepted Answer

C-curve

Answer

S-curve

Answer

I-curve

Answer

None of these

Question 4

The conversion in a mixed reactor/accomplishing a reaction A 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.

Accepted Answer

0.5

Answer

1

Answer

2

Answer

3

Question 5

Pick out the wrong statement.

Accepted Answer

Activation energy for a reaction is obtained from the intercept of the Ar-rhenious plot

Answer

Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition

Answer

Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction

Answer

Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction

Question 6

Pick out the wrong statement.

Accepted Answer

A catalyst initiates a reaction

Answer

A catalyst does not alter the final position of equilibrium in a reversible reaction

Answer

A catalyst is specific in reaction

Answer

A catalyst remains unchanged in chemical composition at the end the reaction

Question 7

Pick out the wrong statement.

Accepted Answer

The intercept of the Arrhenious plot is called the 'activation energy'

Answer

A particular chemical reaction is more temperature sensitive at low temperatures

Answer

A very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically irreversible in nature

Answer

Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

Question 8

Pick out the wrong statement.

Accepted Answer

According to the penetration theory, the mass transfer co-efficient decreases, if the exposure time of an eddy to the solute decreases

Answer

In a first order reaction, A → products; the reaction becomes slower as it proceeds, because the concentration of A decreases and the rate is proportional to the concentration of A

Answer

Transition state theory approaches the problem of calculating reaction rates by concentrating on the idea of activated complexes

Answer

If the rate of an irreversible reaction, A + B → 2C is k.CA.CB, then the reaction is always elementary

Question 9

In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure?

Accepted Answer

N2 + O2 ⇋ 2NO

Answer

PCl3 + Cl2 ⇋ PCl5

Answer

N + 3H2 ⇋ 2NH3

Answer

2SO2 + O2 ⇋ 2SO3