201. __________ resistance is not involved in the combustion of a carbon particle.
Gas film
Ash
Chemical reaction
None of these
✅ The correct answer is option B.
Chemical Reaction Engineering MCQs
202. For a homogeneous reaction of nth order, the dimension of the rate constant is given by
L/(time)n
(concentration)1 – n/(time)
(concentration)n – 1/(time)
None of these
✅ The correct answer is option B.
203. Pick out the wrong statement pertaining to space velocity of flow reactors.
The unit of space velocity is (time)⁻¹
The space velocity of 3 hr⁻¹ means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour
The space velocity of 3 hr⁻¹ means that one third reactor volume of feed at specified conditions are being fed into the reactor
None of these
✅ The correct answer is option C.
204. __________ gas is normally employed in B.E.T.method of finding out the surface area of catalyst.
N₂
H₂
CO₂
He
✅ The correct answer is option A.
205. The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is
Backmix reactor
Plug flow reactor
Series of CSTR
PFR in series
✅ The correct answer is option A.
207. The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the
Reaction is elementary with a molecularity of 2
Molecularity of the reaction is 2, but the reaction may not be elementary
Reaction may be elementary with molecularity of 2
Reaction is elementary but the molecularity may not be 2
✅ The correct answer is option A.
208. BET apparatus is used to determine the
Specific surface of a porous catalyst
Pore size distribution
Pore diameter
Porosity of the catalyst bed
✅ The correct answer is option A.
209. Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.
Zero order
Third order
Consecutive
None of these
✅ The correct answer is option A.
210. For a heterogeneous catalytic reaction
Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important
The catalyst does not form an intermediate complex with the reactant
The surface of the catalyst does not play an important role during reaction
✅ The correct answer is option A.