In the hydrodealkylation of toluene to benzene, the following reactions occur: C7H8 + H2 → C6H6 + CH4 2C6H6 ⇌ C12H10 + H2 Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is__________?
Vegetable oils are hydrogenated in a __________ reactor?
B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm?
Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of __________ order?
‘n’ number of plug flow reactors (P.F.R) in series with a total volume ‘V’ gives the same conversion as one P.F.R. of volume__________?
The concentration of A in a first order reaction, A → B, decreases__________?
Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes?
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________?
The use of space time is preferred over the mean residence time in the design of a/an__________?
For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?
Overall rate of reaction in a heterogeneous 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?
Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum?
For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single__________?
The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the __________?
Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is __________ minutes?
The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is__________?
For a heterogeneous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate – rA0 is invariant with total pressure. The rate controlling step is__________?
Arrhenius equation represents graphically the variation between the __________ and temperature?
The extent of a reaction is __________?
For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ?
Bulk diffusion in catalyst pore __________ with increase in pressure?
Autocatalytic reactions are best carried out in a__________?
Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature?
The rate constant of a reaction is a function of the __________?
The vessel dispersion number (D/μL) for plug flow is__________?
A catalyst promoter__________?
For a homogeneous reaction of nth order, the dimension of the rate constant is given by__________?
With increase in temperature, the rate constant obeying Arrhenius equation__________?
The equilibrium constant ‘K’ of a chemical reaction depends on__________?
The exit age distribution of fluid leaving a vessel is used to know the__________?
Which of the following holds good for an elementary reaction as shown in the bellow figure ?
Non-catalytic fluid-solid reactions are represented by __________ model?
In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes ?
For all positive reaction orders for a particular duty ?
What is the value of ‘n’ if the reaction rate of the chemical reaction A → B, is proportional to CA n and it is found that the reaction rate triples, when the concentration of ‘A’ is increased 9 times ?
The exit age distribution curve E(t) for an ideal CSTR with the average residence time, η, is given by__________?
Limiting reactant in a chemical reaction decides the__________?
Which of the following fixes the volume of a batch reactor for a particular conversion and production rate ?
The rate expression for a heterogeneous catalytic reaction is given by, – rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) ?
An irreversible aqueous phase reaction, A + B → P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed? Data: Heat of reaction = – 50 kJ/mole Density of the reacting mixture = 1000kg/m3 Specific heat of reacting mixture = 2kJ/kg.K The above data can be assumed to be independent of temperature and composition?
A catalyst in a chemical reaction__________?
The following gas phase reaction is taking place in a plug flow reactor. A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X) ?
Mean residence time is equal to the space time, when__________?
In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant)__________?
Knudsen diffusion is directly proportional to __________?
Exposure of a photographic plate to produce a latent image is an example of __________ reaction?
In case of calcination of limestone, CaCO3 CaO + CO2, the addition of more of CaO will result in __________ in the concentration of CO2?
The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CA n, then what is the value of n for this reaction ?
Arrhenius equation shows the variation of __________ with temperature?
The rate constant of a chemical reaction increases by increasing the__________?
What is the dispersion number for a CSTR ?

Promoter_____________________?

A. Initiates a chemical reaction and is a catalyst by itself
B. Alters the position of equilibrium in a reversible reaction
C. Increases the number of active centres by increasing the unevenness of catalyst surface and by
creating discontinuities in the crystals
D. All A., B. and C.

Correct Answer: C. Increases the number of active centres by increasing the unevenness of catalyst surface and by
creating discontinuities in the crystals ✔

Last Updated: February 19, 2019