Explore topic-wise MCQs in Chemical Reaction Engineering.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Reaction Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

For the reaction step to be the controlling mechanism in a catalytic reversible reaction, which of the following is valid?

A. Rate of adsorption > Rate of desorption
B. Rate of adsorption < Rate of desorption
C. Rate of adsorption = Rate of desorption
D. Rate of adsorption Rate of desorption
Answer» D. Rate of adsorption Rate of desorption
Discussion
2.

The sequence of steps in a heterogeneous catalytic reaction is ____

A. Diffusion Adsorption Reaction Desorption Diffusion Mass transfer Mass transfer
B. Mass transfer Diffusion Adsorption Reaction Desorption Diffusion Mass transfer
C. Mass transfer Diffusion Adsorption Desorption Diffusion Mass transfer Reaction
D. Mass transfer Adsorption Diffusion Reaction Desorption Diffusion Mass transfer
Answer» C. Mass transfer Diffusion Adsorption Desorption Diffusion Mass transfer Reaction
Discussion
3.

The Langmuir Hinshelwood mechanism for equimolar reactant feed is ____

A. ( frac{aP}{(1+bP)^2} ) = -r<sub>0</sub>
B. ( frac{P}{(1+bP)^2} ) = -r<sub>0</sub>
C. ( frac{aP}{(bP)^2} ) = -r<sub>0</sub>
D. ( frac{aP}{(1+bP)} ) = -r<sub>0</sub>
Answer» B. ( frac{P}{(1+bP)^2} ) = -r<sub>0</sub>
Discussion
4.

The plot representing the variation of rate with partial pressure for a second order irreversible reaction following Eley Rideal mechanism is ____

A. <img alt="Plot for variation of rate with partial pressure for irreversible reaction - option a" class="alignnone size-full wp-image-284155" height="303" sizes="(max-width: 277px) 100vw, 277px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7a.png 277w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7a-274x300.png 274w" width="277"/>
B. <img alt="Plot for variation of rate with partial pressure for irreversible reaction - option b" class="alignnone size-full wp-image-284154" height="307" sizes="(max-width: 288px) 100vw, 288px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7b.png 288w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7b-281x300.png 281w" width="288"/>
C. <img alt="Plot for variation of rate with partial pressure for irreversible reaction - option c" class="alignnone size-full wp-image-284153" height="316" sizes="(max-width: 277px) 100vw, 277px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7c.png 277w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7c-263x300.png 263w" width="277"/>
D. <img alt="Plot for variation of rate with partial pressure for irreversible reaction - option d" class="alignnone size-full wp-image-284152" height="306" sizes="(max-width: 274px) 100vw, 274px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7d.png 274w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-packed-bed-catalytic-reactor-adsorption-mechanisms-q7d-269x300.png 269w" width="274"/>
Answer» E.
Discussion
5.

A gas phase adsorption reaction is reaction controlling. The reaction follows Eley Rideal mechanism, represented by A + B R. If the product also adsorbs, which of the following rate expressions is true?

A. -r<sub>A</sub> = ( frac{kP_A P_B}{1+ k_A P_A+ k_R P_R} )
B. -r<sub>A</sub> = ( frac{kP_A P_B}{(1+ k_A P_A+ k_R P_R)^2} )
C. -r<sub>A</sub> = ( frac{kP_A P_B}{1+ k_A P_A+ k_R P_R} )
D. -r<sub>A</sub> = ( frac{kP_A P_B P_R}{(1+ k_A P_A+ k_R P_R)^2} )
Answer» B. -r<sub>A</sub> = ( frac{kP_A P_B}{(1+ k_A P_A+ k_R P_R)^2} )
Discussion
6.

If n is a constant for a particular gas adsorption, the dependence of ( frac{V}{V_m} ) to the partial pressure of adsorbed gas by Freundlich adsorption is ____

A. ( frac{V}{V_m} ) p<sub>A</sub> (^ frac{n}{2} )
B. ( frac{V}{V_m} ) p<sub>A</sub> (^ frac{1}{n} )
C. ( frac{V}{V_m} ) p<sub>A</sub><sup>n</sup>
D. ( frac{V}{V_m} ) p<sub>A</sub>
Answer» C. ( frac{V}{V_m} ) p<sub>A</sub><sup>n</sup>
Discussion
7.

According to Langmuir adsorption model, the rate of adsorption of a gas molecule onto the solid surface is ____

A. Proportional to the square of the partial pressure of the gas
B. Proportional to the partial pressure of the gas
C. Inversely proportional to the square of the partial pressure of the gas
D. Inversely proportional to the partial pressure of the gas
Answer» C. Inversely proportional to the square of the partial pressure of the gas
Discussion
8.

Which of the following is not an assumption of Langmuir model?

A. Energy of adsorption of gas molecules to the adsorbent site is different at different adsorbing site
B. Maximum amount of adsorption corresponds to a monolayer
C. Desorption rate depends on the amount of material adsorbed onto the solid surface
D. Gas phase molecules are adsorbed on discrete points on the solid surface
Answer» B. Maximum amount of adsorption corresponds to a monolayer
Discussion
9.

The variation of Chemisorption with Pressure is ____

A. Chemisorption increases with increase in pressure
B. Chemisorption decreases with increase in pressure
C. Chemisorption increases with decrease in pressure
D. Change of pressure has no effect on Chemisorption
Answer» E.
Discussion
10.

State true or false.Physisorption occurs by Van-der-waal s forces.

A. True
B. False
Answer» B. False
Discussion