keff = k + kg
keff = (k+ kg)/2
keff = (kkg)1/2
1/keff = 1/k + 1/kg
✅ The correct answer is option D.
Chemical Reaction Engineering MCQs
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.
Increases
Decreases
Remains unaffected
Unpredictable from the data
✅ The correct answer is option A.
For multiple reactions, the flow pattern within the vessel affects the
Size requirement
Distribution of reaction products
Both A and B
Neither A nor B
✅ The correct answer is option C.
In a continuous flow stirred tank reactor, the composition of the exit stream
Is same as that in the reactor
Is different than that in the reactor
Depends upon the flow rate of inlet stream
None of these
✅ The correct answer is option A.
A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)
∝ CA
∝ 1/CA
Independent of temperature
None of these
✅ The correct answer is option D.
Higher free energy of activation of a chemical reaction (at a given temperature) implies
Slower rate of reaction
Higher rate of reaction
Higher equilibrium conversion
Both B and C
✅ The correct answer is option A.
Promoter is added to the catalyst to improve its
Porosity
Sensitivity
Surface area
None of these
✅ The correct answer is option B.
Catalyst is a substance, which __________ chemical reaction.
Increases the speed of a
Decreases the speed of a
Can either increase or decrease the speed of a
Alters the value of equilibrium constant in a reversible
✅ The correct answer is option A.
Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?
Langmuir
There is no dynamic equilibrium between successive layer
The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process
None of these
✅ The correct answer is option B.
In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.
100
1000
10000
100000
✅ The correct answer is option B.