301. Variables affecting the rate of homogeneous reactions are
Pressure and temperature only
Temperature and composition only
Pressure and composition only
Pressure, temperature and composition
✅ The correct answer is option D.
Chemical Reaction Engineering MCQs
302. A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
Less than
Equal to
More than
Equal to or more than
✅ The correct answer is option D.
303. In case of a __________ reactor, the composition in the reactor and at the exit of the reactor is the same.
Semi-batch
Tubular
Batch
Back-mix
✅ The correct answer is option D.
304. The percent conversion of ethanol in the reactor is
100
97.5
95
2.5
✅ The correct answer is option A.
305. A catalyst in a chemical reaction __________ free energy change in the reaction.
Increases
Decreases
Either A or B; depends on the type of catalyst
Neither A nor B
✅ The correct answer is option C.
306. As the chemical reaction proceeds, the rate of reaction
Increases
Decreases
Remains same
May increase or decrease depending on the type of reaction
✅ The correct answer is option B.
307. Sometimes, batch process is preferred over continuous process, when the product
Quality & yield can not be achieved in continuous processes, because of long residence time
Sales demand is fluctuating
Both A & B
Neither A nor B
✅ The correct answer is option C.
308. For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is
2
4
11
22
✅ The correct answer is option C.
309. In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.
Adiabatic
Isothermal
Non-adiabatic
None of these
✅ The correct answer is option C.
310. Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?
Temperature should be high in the beginning and decreased towards the end of the reaction
Very low temperature should be used throughout the reaction
Very high temperature should be used throughout the reaction
None of these
✅ The correct answer is option A.