211. A Catalyst
Increases the equilibrium concentration of the product
Changes the equilibrium constant of the reaction
Shortens the time to reach the equilibrium
None of these
✅ The correct answer is option C.
Chemical Reaction Engineering MCQs
212. When a catalyst increases the rate of chemical reaction, the rate constant
Decreases
Increases
Remains constant
Becomes infinite
✅ The correct answer is option B.
213. For any reaction, we may write conversion as a function of
Time
Temperature
Concentration
All of the above
✅ The correct answer is option D.
214. A catalyst in a chemical reaction
Decreases the activation energy
Alters the reaction mechanism
Increases the frequency of collisions of reacting species
All of the above
✅ The correct answer is option D.
215. The effectiveness factor for large value of Thiele modulus (L√(K/D1)) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm²/second)
L√(K/D1)
1/(L√(K/D1))
1
∞
✅ The correct answer is option B.
216. The concentration of A in a first order reaction, A → B, decreases
Linearly with time
Exponentially with time
Very abruptly towards the end of the reaction
Logarithmically with time
✅ The correct answer is option B.
217. Consider the ‘n’ th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot?
CA0 Vs t1/2
Ln CA0 Vs t1/2
CA0 Vs ln t1/2
Ln CA0 Vs ln t1/2
✅ The correct answer is option C.
218. Space velocity
Describes the extensive operating characteristics of a tubular flow reactor
Is the maximum feed rate pre unit volume of reactor for a given conversion
Is a measure of the ease of the reaction
All of the above
✅ The correct answer is option D.
219. Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature?
Time
Useful volume of the tank
Diameter of the reactor
None of these
✅ The correct answer is option A.
220. For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
Film diffusion
Diffusion through ash layer
Chemical reaction
Either A, B or C
✅ The correct answer is option C.