Free Chemical Reaction Engineering MCQs with Answers
395 Chemical Reaction Engineering MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Increasing the concentration of N2
- B. Decrease in pressure
- C. Increase in pressure
- D. Decrease in temperature
Explanation: Formation of NO is endothermic, so the reverse decomposition is exothermic and is favoured by lowering the temperature.
Correct answer: Decrease in temperature- A. Both low temperature and high pressure
- B. Low pressure
- C. Low temperature only
- D. High temperature
Explanation: Ammonia formation is exothermic, so lowering temperature favours it, while the reaction changes four gas moles into two and therefore high…
Correct answer: Both low temperature and high pressure3. The unit of equilibrium constant of a chemical reaction is the same as that of__________________?
- A. Molar concentration
- B. Temperature
- C. None of these
- D. Internal energy
Explanation: The units of an equilibrium constant depend on the reaction stoichiometry and the convention used for activities, so they are not…
Correct answer: None of these- A. Increase the partial pressure of H2
- B. Increase the partial pressure of I2
- C. Increase the total pressure and hence shift the equilibrium towards the right
- D. Not affect the equilibrium conditions
Explanation: For H + I e2 2HI, the change in gaseous moles is zero, so adding an inert gas cannot alter the equilibrium composition.
Correct answer: Not affect the equilibrium conditions- A. Increases, for an exothermic reaction
- B. Decreases, for an exothermic reaction
- C. Increases, for an endothermic reaction
- D. None of these
Explanation: For an exothermic reaction, heat behaves like a product, so raising temperature shifts equilibrium toward reactants and lowers the…
Correct answer: Increases, for an exothermic reaction- A. Zero
- B. Not possible to predict
- C. Very large compared to that for endothermic reaction
- D. Negative
Explanation: The sign or magnitude of activation energy cannot be determined merely from whether a reaction is exothermic or endothermic; it depends on…
Correct answer: Not possible to predict- A. The equilibrium constant of a reaction depends upon temperature only
- B. With increase in temperature, the equilibrium constant increases for an exothermic reaction
- C. The conversion for a gas phase reaction increases with increase in pressure, if there is a
- D. decrease in volume accompanying the reaction
Explanation: For an exothermic reaction, heat behaves like a product, so increasing temperature shifts equilibrium backward and decreases the…
Correct answer: With increase in temperature, the equilibrium constant increases for an exothermic reaction- A. Law of corresponding state
- B. Kopp's rule
- C. Le-Chatelier principle
- D. Arrhenius hypothesis
Explanation: Le Chatelier's principle predicts that an equilibrium responds to a change in temperature, pressure, or concentration by shifting in the…
Correct answer: Le-Chatelier principle- A. Law of mass action
- B. Henry's law
- C. Hess's law
- D. None of these
Explanation: The law of mass action expresses the equilibrium constant in terms of the activities or concentrations of reactants and products, each…
Correct answer: Law of mass action- A. Very high pressure is required resulting in costly pressure vessel
- B. Rate of reaction is very low
- C. Space velocity of gas is very low resulting in decreased conversion
- D. None of these
Explanation: Lowering temperature improves the equilibrium yield of ammonia, but it greatly reduces the reaction rate because N2 dissociation is…
Correct answer: Rate of reaction is very low- A. 1500-1700
- B. 300 - 450
- C. 700 - 1000
- D. 100-200
Explanation: Naphtha steam reforming is carried out at high temperature, commonly in the approximate range of 700 to 1000°C, to promote the strongly…
Correct answer: 700 - 1000- A. Nickel
- B. Pt-Rh
- C. Silica gel
- D. Co-Mo
Explanation: Cobalt-molybdenum catalysts, commonly supported on alumina, are used for hydrodesulphurisation of naphtha.
Correct answer: Co-Mo- A. 3.5 : 1
- B. 1.5 : 1
- C. 10 : 1
- D. 15 : 1
Explanation: A steam-to-carbon ratio of about 3.5:1 is commonly maintained in naphtha reforming to provide sufficient steam for conversion and to limit…
Correct answer: 3.5 : 1- A. High pressure, low reactants concentration, high temperature
- B. High pressure, high reactants concentration, low temperature
- C. High pressure, low reactants concentration, low temperature
- D. Low pressure, high reactants concentration, low temperature
Explanation: Ammonia synthesis is favoured by high pressure, high reactant concentration, and low temperature because the reaction forms fewer gas…
Correct answer: High pressure, high reactants concentration, low temperature- A. Al2O3
- B. Cr2O3
- C. K2O
- D. MnO
Explanation: Ammonia synthesis uses promoted iron, with K2O acting as an electronic promoter that improves catalyst performance.
Correct answer: K2O- A. Iron
- B. Nickel
- C. Vanadium pentoxide
- D. Alumina
Explanation: The Haber process uses finely divided iron as the main catalyst, usually promoted by oxides such as K2O, Al2O3 and CaO.
Correct answer: Iron- A. Endothermic
- B. Exothermic
- C. Autocatalytic
- D. None of these
Explanation: The Haber reaction, N2 + 3H2 ⇌ 2NH3, releases heat, so ammonia synthesis is exothermic.
Correct answer: Exothermic- A. Stabilisation
- B. Increasing the effectiveness
- C. All A, B & C
- D. Improving the strength & heat resistance
Explanation: Promoters improve several catalyst properties, including activity, stability, mechanical strength and resistance to heat.
Correct answer: All A, B & C- A. Autocatalytic
- B. Non-catalytic
- C. Exothermic
- D. Endothermic
Explanation: Steam reforming converts hydrocarbons with steam to synthesis gas and requires heat because the reforming reaction is strongly…
Correct answer: Endothermic- A. High cost of the high pressure vessel used for the reactor
- B. Comparatively higher pressure drop
- C. Higher pumping cost
- D. Chances of entrainment and disturbance of catalyst bed
Explanation: Ammonia synthesis occurs at very high pressure, so using several separate high-pressure reactor vessels would greatly increase equipment…
Correct answer: High cost of the high pressure vessel used for the reactorChemical Reaction Engineering MCQs: common questions
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There are 395 Chemical Reaction Engineering MCQs in the Chemical Engineering bank, shown 20 to a page with the correct answer and an explanation on each.
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