Chemical Reaction Engineering MCQs

Question 1

With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be

Accepted Answer

Higher in P.F. reactor

Answer

Higher in CSTR

Answer

Same in both the reactors

Answer

Data insufficient; can't be predicted

Question 2

The fractional volume change of the system for the isothermal gas phase reaction, A → 3B, between no conversion and complete conversion is

Accepted Answer

2

Answer

0.5

Answer

1

Answer

3

Question 3

The rate constant of a chemical reaction decreases by decreasing the

Accepted Answer

Temperature

Answer

Pressure

Answer

Concentration of reactants

Answer

Duration of reaction

Question 4

Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because

Accepted Answer

CO2 escapes continuously

Answer

CaO is not dissociated

Answer

Of high calcination temperature

Answer

CaO is more stable than CaCO3

Question 5

For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times.

Accepted Answer

16

Answer

8

Answer

12

Answer

32

Question 6

The rate constant of a chemical reaction increases by increasing the

Accepted Answer

Temperature

Answer

Pressure

Answer

Reactant's concentration

Answer

None of these

Question 7

Knudsen diffusion is directly proportional to

Accepted Answer

$$\sqrt {	ext{T}} $$

Answer

T

Answer

$$\frac{1}{{\sqrt {	ext{T}} }}$$

Answer

T2

Question 8

Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is

Accepted Answer

$$\frac{1}{4}$$

Answer

$$\frac{1}{2}$$

Answer

$$\frac{1}{3}$$

Answer

$$\frac{1}{5}$$

Question 9

For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.

Accepted Answer

Chemical

Answer

Physical

Answer

Both A and B

Answer

Neither A nor B