Chemical Reaction Engineering MCQs

A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is – 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be

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5°C
10°C
20°C
100°C
✅ The correct answer is option B.

The rate expression for a heterogenous catalytic reaction is given by, – rA = K.KA PA(1 + KA.PA + Kr.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)

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E
E + ΔHA
E + ΔHA – ΔHR
ΔHA + ΔHR
✅ The correct answer is option C.

“A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?A. Inner catalyst core of radius R/8 does not participate in reaction.”

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Inner catalyst core of radius R/8 does not participate in reaction
Inner catalyst core of radius R/2 does not participate in reaction
Inner catalyst core of radius 7R/8 does not participate in reaction
Ffectiveness factor for a zero order reaction can not be 7/8 as it must always be 1
✅ The correct answer is option A.

During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the

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Temperature is increased
Pressure is reduced
Temperature is increased and pressure is reduced
Temperature is reduced and pressure is increased
✅ The correct answer is option D.