Chemical Reaction Engineering MCQs

Question 1

The equilibrium constant K of a chemical reaction depends on

Accepted Answer

Temperature only

Answer

Pressure only

Answer

Temperature and pressure

Answer

Ratio of reactants

Question 2

A photochemical reaction is

Accepted Answer

Initiated by light

Answer

Accompanied with emission of light

Answer

Catalysed by light

Answer

All of the above

Question 3

A rise in temperature

Accepted Answer

All of the above

Answer

Normally tends to increase the reaction rate

Answer

Does not affect a catalysed reaction

Answer

Does not affect photo-chemical reaction rates

Question 4

Pick out the wrong statement pertaining to space velocity of flow reactors.

Accepted Answer

The space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor

Answer

The unit of space velocity is (time)-1

Answer

The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour

Answer

None of these

Question 5

A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by

Accepted Answer

Diffusion within the pellet

Answer

Reaction

Answer

External mass transfer

Answer

None of the above

Question 6

Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ⇋ 2NH3.

Accepted Answer

Increases

Answer

Decreases

Answer

Remains unchanged

Answer

Unpredictable from the data

Question 7

Half life period of a chemical reaction is proportional to CA0-1, if the reaction is of __________ order.

Accepted Answer

Second

Answer

First

Answer

Zero

Answer

Third

Question 8

The unit of frequency factor in Arhenious equation is

Accepted Answer

Same as that of rate constant

Answer

Same as that of activation energy

Answer

Dimensionless

Answer

None of these

Question 9

The rate of reaction of a/an __________ reaction is not affected by temperature rise.

Accepted Answer

Photochemical

Answer

Autocatalytic

Answer

Consecutive

Answer

Zero order