MCQOPTIONS
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MCQOPTIONS
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 | |
| 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 | |
| 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> | |
| 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. | |
| 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} ) | |
| 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> | |
| 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 | |
| 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 | |
| 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. | |
| 10. |
State true or false.
|
| A. | True |
| B. | False |
| Answer» B. False | |