Q 1: The experimentally determined overall order for the reaction A + B → C + D is two. Then the
Q 2: The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is
Q 3: For the liquid phase parallel reactions,
the desired product is R. A higher selectivity of R will be achieved if the reaction is conducted at
Q 4: In solid-catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for
Q 5: At a given temperature, K1, K2, and K3 are the equilibrium constants for the following reactions 1, 2, and 3 respectively:
CH_4(g)+H_2O(g)\leftrightarrow CO(g)+3H_2(g)
CO(g)+H_2O(g)\leftrightarrow CO_2(g)+H_2(g)
CH_4(g)+2H_2O(g)\leftrightarrow CO_2(g)+4H_2(g)
Then K1, K2 and K3 are related as
Q 6: The conversion for a first-order liquid-phase reaction A → B in a CSTR is 50 %. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be
Q 6: The following half-life data are available for the irreversible liquid phase reaction, A → Product:
| Initial concentration (kmol/m3) | Half-life (min) |
| 2 | 2 |
| 8 | 1 |
The overall order of the reaction is
Q 7: The first-order series reaction A\xrightarrow{k_1}B\xrightarrow{k_2}C is conducted in a batch reactor. The initial concentrations of A, B, and C (CA0, CB0 & CC0 respectively) are all non-zero. The variation of CB with reaction time will not show a maximum if
Q 8: The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3 is fed to the reactor at the rate of 0.01 m3/s and at a temperature of 500 K. If the exit conversion is 20 %, then the exit temperature (in K) is
Data: Heat of reaction at 298 K = -50,000 kJ/kmol of A reacted; Heat capacities, CPA = CPB = 100 kJ/kmol K (may be assumed to be independent of temperature).
Q 9: The rate-controlling step for the heterogeneous irreversible catalytic reaction
A(g)+B(g)\rightarrow C(g)is the surface reaction of adsorbed A with adsorbed B to give adsorbed C. The rate expression for this reaction can then be written as
Note: KA, KB, and KC are the adsorption equilibrium constants and k is the rate constant of the rate-controlling step.
Q 10: The elementary second-order liquid phase reaction A+B\rightarrow C+D is conducted in an isothermal plug flow reactor of 1 m3 capacity. The inlet volumetric flow rate is 10 m3/h and CA0 = CB0 = 2 kmol/m3. At these conditions, the conversion of A is 50 %. Now, if a stirred tank reactor of 2 m3 capacity is installed in series, upstream of the plug flow reactor, then what conversion can be expected in the new system of reactors?
Q 11: The following liquid phase reactions are carried out in a PFR:
A+C\rightarrow2B+P;\;\;\;r_P=k_1C_AC_C A\rightarrow D;\;\;\;\;r_D=k_2C_AWhat is the ratio of moles of P formed to moles of D formed at the reactor exit if the conversion of C is 50 %? No product is present in the feed.
Data: CA0 = CC0 = 2 kmol/m3, k1 = 1 m3/(kmol s), k2 = 1 s-1