121. Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the
Activation energy
Equilibrium constant
Heat of reaction
None of these
✅ The correct answer is option A.
Chemical Reaction Engineering MCQs
122. Thermodynamic equilibrium constant in a system is affected by
Inerts
Pressure
Temperature
All of the above
✅ The correct answer is option C.
123. A batch reactor is
Suitable for gas-phase reactions on commercial scale
Suitable for liquid phase reactions involving small production rate
Least expensive to operate for a given rate
Most suitable for very large production rate
✅ The correct answer is option B.
124. 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
Diffusion within the pellet
Reaction
External mass transfer
None of the above
✅ The correct answer is option A.
126. Inversion of cane sugar is an example of
Unimolecular reaction with first order
Bimolecular reaction with second order
Bimolecular reaction with first order
Unimolecular reaction with second order
✅ The correct answer is option C.
127. Reverse reaction in a chemical equilibrium is favoured by the
Removal of one of the products regularly
Increase in the concentration of oneof the products
Increase in the concentration of one of the reactants
None of these
✅ The correct answer is option B.
128. A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m³ ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min⁻¹ ; (ΔH) = – 40kJ/mole; ρ = 1000kg/m³ CP = 4 J/gm.°C ; q = 10⁻³ m³/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
2/3 kW
1kW
5/3 kW
4kW
✅ The correct answer is option C.
129. Molecularity of a reaction
Is always equal to the overall order of reaction
May not be equal to the order of reaction
Can
Both B and C
✅ The correct answer is option D.
130. A batch reactor suffers from following disadvantage.
Poor product quality control
High labour and handling cost
High shutdown time requirement for emptying, cleaning and refilling
All of the above
✅ The correct answer is option D.