T ∝ 1/an
T ∝ 1/an – 1
T ∝ 1/an + 1
T ∝ an
✅ The correct answer is option B.
Chemical Reaction Engineering MCQs
32. There is no correspondence between stoichiometry and the rate equation in case of a/an __________ reaction.
Elementary
Multiple
Autocatalytic
Non-elementary
✅ The correct answer is option D.
33. For an ideal plug flow reactor, the value of Peclet number is
0
∞
1
10
✅ The correct answer is option B.
34. The catalyst in a second order reversible reaction increases the rate of the forward reaction
And decreases that of backward reaction
And backward reaction equally
Only
To a greater extent than that of the backward reaction
✅ The correct answer is option B.
35. For a mixed flow reactor operating at steady state, the rate of reaction is given by
FA0/V – dCsub>A/dt
FA0/V + dCsub>A/dt
FA0/V . Xsub>A
✅ The correct answer is option C.
37. Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
Proportional to
Independent of
Inversely proportional to
Proportional to the square of
✅ The correct answer is option A.
38. A first order reaction requires two equal sized CSTR. The conversion is
Less when they are connected in series
More when they are connected in series
More when they are connected in parallel
Same whether they are connected in series or in parallel
✅ The correct answer is option B.
39. Reactions with high activation energy are
Very temperature sensitive
Temperature insensitive
Always irreversible
Always reversible
✅ The correct answer is option A.
40. The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is
8987°K
9210°K
8764°K
8621°K
✅ The correct answer is option B.