Chemical Reaction Engineering MCQs

Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1 m3/h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m3, the volume of the mixed flow reactor should be increased by a factor of

The decomposition of A into B is represented by the exothermic reaction, A ⇋ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction.

A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.

The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.

Pick out the wrong statement below: I. For the same conversion, the holding time required in a batch reactor, is always equal to the space time required in a PFR. II. 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. III. Arrehenius equation describing the effect of temperature on rate constant is given by, $${\text{K}} = {\text{A}}.{{\text{e}}^{ - \frac{{{\text{Ea}}}}{{{\text{RT}}}}}}$$ IV. 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 CH3CHO is equal to K.CCH3l.CHl and acts as a catalyst.

The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.

For a first order reaction carried out in a plug flow reactor, the space time is

When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.