Chemical Reaction Engineering MCQs Archives

381. For a first order reaction carried out in a plug flow reactor, the space time is

1/K In C0/C

1/K In C/C0

K In C0/C

K In C/C0

✅ The correct answer is option A.

382. For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of ‘P’ is doubled. If the reaction rate is proportional to Cpn, then what is the value of ‘n’ for this chemical reaction

✅ The correct answer is option A.

383. If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to

The intrinsic activation energy E

(E + ED) where ED is activation due to diffusion

(E + ED)/2

ED/2

✅ The correct answer is option D.

384. An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is

Maximum at the inlet of the reactor

Maximum at the exit of the reactor

Maximum at the centre of the reactor

Constant throughout the reactor

✅ The correct answer is option A.

385. In which of the following reactions, thee-quilibrium will shift to the right, if the total pressure is increased?

H₂ + Cl₂ ⇋ 2HCl

N₂ + O₂ ⇋ 2NO

N₂O₄ ⇋ 2 NO₂

H₂ + I₂ ⇋ 2HI

✅ The correct answer is option B.

386. For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

Catalyst size is reduced or the catalyst diffusivity is reduced

Catalyst size is reduced or the catalyst diffusivity is increased

Catalyst size is increased or the catalyst diffusivity is reduced

Catalyst size is increased or the catalyst diffusivity is increased

✅ The correct answer is option B.

387. What is the dispersion number for a plug flow reactor?

-1

✅ The correct answer is option A.

388. An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will __________ with decrease in space time.

Increase

Increase exponentially

Decrease

Remain unchanged

✅ The correct answer is option C.

389. What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?

Zero

First

Second

Third

✅ The correct answer is option B.

390. Reaction rate of a first order reaction, which is half completed in 23 minutes will be

0.03 sec⁻¹

0.03 min⁻¹

0.03 hr⁻¹

0.05 min⁻¹

✅ The correct answer is option B.