MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical 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. | \(\frac{aP}{(1+bP)^2}\) = -r0 |
| B. | \(\frac{P}{(1+bP)^2}\) = -r0 |
| C. | \(\frac{aP}{(bP)^2}\) = -r0 |
| D. | \(\frac{aP}{(1+bP)}\) = -r0 |
| Answer» B. \(\frac{P}{(1+bP)^2}\) = -r0 | |
| 4. |
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. | -rA = \(\frac{kP_A P_B}{1+ k_A P_A+ k_R P_R} \) |
| B. | -rA = \(\frac{kP_A P_B}{(1+ k_A P_A+ k_R P_R)^2} \) |
| C. | -rA = \(\frac{kP_A P_B}{1+ k_A P_A+ k_R P_R} \) |
| D. | -rA = \(\frac{kP_A P_B P_R}{(1+ k_A P_A+ k_R P_R)^2} \) |
| Answer» B. -rA = \(\frac{kP_A P_B}{(1+ k_A P_A+ k_R P_R)^2} \) | |
| 5. |
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. | \(\frac{V}{V_m}\) ∝ pA\(^\frac{n}{2} \) |
| B. | \(\frac{V}{V_m}\) ∝ pA\(^\frac{1}{n} \) |
| C. | \(\frac{V}{V_m}\) ∝ pAn |
| D. | \(\frac{V}{V_m}\) ∝ pA |
| Answer» C. \(\frac{V}{V_m}\) ∝ pAn | |
| 6. |
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 | |
| 7. |
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 | |
| 8. |
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. | |
| 9. |
State true or false.Physisorption occurs by Van-der-waal’s forces. |
| A. | True |
| B. | False |
| Answer» B. False | |