Chemical Reaction Engineering MCQs

1. A trickle bed reactor is the one, which

Has altogether three streams either entering or leaving

Processes three reactants at different flow rates

Processes three reactants with same flow rate

Employs all the three phases (i.e.. .solid, liquid and gas)

✅ The correct answer is option D.

2. For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by

A dirac delta function

A step function

A ramp function

None of the above

✅ The correct answer is option D.

3. Organic catalysts differ from the inorganic catalyst in the sense that the former is

Active at cryogenic temperatures only

Prohibitively costly

Proteinous in nature

Active at very high temperature only

✅ The correct answer is option C.

4. For all positive reaction orders for a particular duty,

Mixed reactor is always larger than the plug-flow reactor

Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order

Reactor size is independent of the type of flow

Density variation during reaction affects design

✅ The correct answer is option A.

5. Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is __________ minutes.

✅ The correct answer is option B.

6. Find a mechanism that is consistent with the rate equation and reaction given below: 2A + B → A₂B, ( – rA) = k.CA.CB

A + B ⇋ AB ; AB + A → A2B

A + B → AB ; AB + A → A2B

A + A → AA ; AA + B → A2B

A + A ⇋ AA ; AA + B → A2B

✅ The correct answer is option D.

7. Conversion increases with increase in temperature in case of a an __________ reaction.

Autocatalytic

Irreversible

Reversible endothermic

Reversible exothermic

✅ The correct answer is option C.

8. The rate constant of a first order reaction depends on the

Concentration of the reactant

Temperature

Concentration of the product

Time

✅ The correct answer is option B.

9. The equilibrium constant of chemical reaction __________ in the presence of catalyst.

Increases

Decreases

Remains unaffected

Can either increase or decrease (depends on the type of catalyst)

✅ The correct answer is option C.

10. A batch reactor is suitable for

Achieving cent percent conversion of reactants into products

Large scale gaseous phase reactions

Liquid phase reactions

Obtaining uniform polymerisation products in highly exothermic reactions

✅ The correct answer is option C.