281. If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is
Zero
One
Two
Three
✅ The correct answer is option B.
Chemical Reaction Engineering MCQs
282. In case of a P.F.R., there
May be lateral mixing of fluid
Should not be any mixing along the flow path
Both A and B
Neither A nor B
✅ The correct answer is option C.
283. For reaction, P + 2 → 3R, molar rate of consumption of P is
Double of that of Q
Same as that of Q
Half of that of Q
2/3rd of that of Q
✅ The correct answer is option C.
284. A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are
Equal in size
Of different sizes
Of such size that the ratio of their volumes is < 5
None of these
✅ The correct answer is option A.
285. For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
Is independent of pressure
Increases with pressure
Decreases with pressure
Increases /decreases with pressure depending on the stoichiometric co-efficients of the reaction
✅ The correct answer is option B.
286. A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.
Less than
Equal to
More than
Equal to or more than
✅ The correct answer is option D.
287. B.E.T. method can be used to determine the __________ of a porous catalyst.
Solid density
Pore volume
Surface area
All of the above
✅ The correct answer is option C.
288. The rate constant of a chemical reaction increases by increasing the
Temperature
Pressure
Reactant’s concentration
None of these
✅ The correct answer is option A.
289. An imbalanced chemical reaction equation is against the law of
Multiple proportion
Conservation of mass
Constant proportion
None of these
✅ The correct answer is option B.
290. Velocity of a reaction depends upon the
Nature of the reactants
Concentration of the reactants
Temperature at which the reaction is carried
All of the above
✅ The correct answer is option D.