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. Used to convert heat energy into
- B. Accompanied with emission of
- C. Catalysed by
- D. Initiated by
Explanation: Photochemical reactions obtain the initiating energy from absorbed radiation, so light starts the reaction by exciting molecules or…
Correct answer: Initiated by- A. k2 CB0 > k1 CA0
- B. k CA0 > k2.CB0
- C. CB0 > CA0
- D. CA0 > CB0
Explanation: For A → B → C, B initially rises only when its formation rate, k₁C_A0, exceeds its consumption rate, k₂C_B0.
Correct answer: k2 CB0 > k1 CA0- A. More than
- B. Same as
- C. Less than
- D. Data insufficient; can't be predicted
Explanation: A first-order reaction has a constant half-life, t₁/₂ = ln 2/k, independent of the starting concentration.
Correct answer: Same as- A. Phenol
- B. Naphthalene
- C. Isopropanol
- D. Ethyl benzene
Explanation: Isopropanol undergoes catalytic dehydrogenation to form acetone and hydrogen: (CH₃)₂CHOH → (CH₃)₂CO + H₂.
Correct answer: Isopropanol- A. Phenol
- B. Ethyl alcohol
- C. Cumene
- D. Styrene
Explanation: Dehydrogenation removes hydrogen from ethylbenzene and forms styrene, an important monomer used to make polystyrene.
Correct answer: Styrene- A. Formaldehyde
- B. Phenol
- C. Acetone
- D. Maleic anhydride
Explanation: Catalytic oxidation-dehydrogenation of methanol converts it to formaldehyde, commonly using a silver or metal-oxide catalyst.
Correct answer: Formaldehyde- A. Dehydration
- B. Reduction
- C. Oxidation
- D. Polymerisation
Explanation: Biological treatment oxidises biodegradable organic matter, mainly through microbial activity, converting it into carbon dioxide, water…
Correct answer: Oxidation- A. -5 to 0
- B. 5 to 10
- C. 75 to 80
- D. 30 to 50
Explanation: Many fermentation processes use dilute nutrient solutions and are carried out near the moderate-temperature range of about 30 to 50°C.
Correct answer: 30 to 50- A. Vanadium
- B. Nickel
- C. Alumina
- D. Iron
Explanation: Commercial oxidation of ortho-xylene to phthalic anhydride uses vanadium pentoxide, usually supported on a carrier.
Correct answer: Vanadium- A. Autothermal
- B. Trickle bed
- C. Plug flow
- D. None of these
Explanation: Vegetable-oil hydrogenation commonly uses a trickle-bed reactor, where liquid oil and hydrogen pass over a fixed bed of catalyst…
Correct answer: Trickle bed- A. Fischer-Tropsch process
- B. Ostwald's process of HNO3 manufacture
- C. Hydrogenation of oil
- D. Shift conversion
Explanation: The Ostwald process oxidizes ammonia over a platinum-rhodium gauze catalyst, not nickel.
Correct answer: Ostwald's process of HNO3 manufacture392. Catalyst used in the oxidation of benzene to produce Maleic anhydride is ______________________?
- A. Ni
- B. Pt
- C. V2O5
- D. Cr
Explanation: Vanadium pentoxide, V₂O₅, catalyses the vapor-phase oxidation of benzene to maleic anhydride.
Correct answer: V2O5- A. Platinum
- B. Cobalt
- C. Vanadium
- D. Nickel
Explanation: Platinum is a highly active oxidation catalyst in automobile catalytic converters, promoting conversion of CO to CO₂ and oxidation of…
Correct answer: Platinum- A. y = k1 ln (k2t + k3)
- B. y2 = 2k1t + k2
- C. y = k1 t + k2
- D. y = k1t3 + k2
Explanation: A parabolic oxidation law means the square of film thickness increases linearly with time, giving y² = 2k₁t + k₂ in the notation used.
Correct answer: y2 = 2k1t + k2- A. Sec-1. mole°
- B. Moles1. sec-1
- C. Moles-1. sec1
- D. Moles1. sec1
Explanation: For a second-order rate law, rate = kC², so k = rate/C². Its units are concentration⁻¹ time⁻¹, commonly L mol⁻¹ s⁻¹, matching option c…
Correct answer: Moles-1. sec1