411. 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.
Chemical Reaction Engineering MCQs
412. 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.
413. Promoter is added to the catalyst to improve its
Porosity
Sensitivity
Surface area
None of these
✅ The correct answer is option B.
414. 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.
415. 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.
416. 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.
417. In Langmuir treatment of adsorption,
Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site
All the adsorption does not take place by the same mechanism
Extent of adsorption is more than one complete monomolecular layer on the surface
✅ The correct answer is option B.
418. The effect of increasing pressure on the gaseous equilibrium of the reaction 2X+3Y ⇋ 3X+2Y indicates that
Pressure has no effect
Backward reaction is favoured
Forward reaction is favoured
None of these
✅ The correct answer is option A.
419. The energy balance equation over a tubular reactor under transient conditions is
An ordinary non-linear differential equation
An algebric differential equation
A linear partial differential equation
A non-linear partial differential equation
✅ The correct answer is option C.
420. Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in
Blood
Saliva
Intestine
Gland
✅ The correct answer is option B.