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Chemical Engineering - Chemical Reaction Engineering

Exercise : Chemical Reaction Engineering - Section 6
36.
Pick out the wrong statement.
Autocatalytic reactions are exemplified by microbial fermentation reactions.
The slowest step has the greatest influence on the overall reaction rate in case of an irreversible series reaction.
The fractional conversion at any time is same for both the constant as well as the variable volume system in case of an irreversible unimolecular type first order reaction.
Hydrolysis of ester in presence of alkali or acid is a zero order reaction.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm2 /sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec . V = volume, cm3.)
Reactor dispersion number (D/vL)
Reduced time
Thiele modulus
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Pick out the wrong statement
For the same conversion, the holding time required in a batch reactor, is always equal to the space time required in a PFR.
Two mixed reactors of unequal size are available for producing a specified product, formed by a homogenous second order reaction. To achieve maximum production rate, the smaller reactor should be placed in series before the larger reactor.
Arrehenius equation describing the effect of temperature on rate constant is given by, K = A.e-Ea/RT
The mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is:
CH3CHO +I2 CH3I + HI + CO; slow
CH3I + HI CH4 + I2; fast
Then the rate of disappearance of CH3CHO is equal to K.CCH3I.CHI and acts as a catalyst.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
The energy of activation of a chemical reaction
is same as heat of reaction at constant pressure.
is the minimum energy which the molecules must have before the reaction can take place.
varies as fifth power of the temperature.
both (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Chemical kinetics can predict the __________ of a chemical reaction.
rate
feasibility
both (a) & (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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