Chemical Reaction Quiz 3

For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to ______?

For reactions in parallel viz A ? P (desired product) and A ? Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a__________?

For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant ?

For an isothermal second order aqueous phase reaction, A ? B, the ratio of the time required for 90% conversion to the time required for 45% conversion is______?

For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the _________ is the controlling resistance?

For the irreversible elementary reactions in parallel as shown in the bellow figure, the rate of disappearance of ?X? is equal to________?

For every 10?C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70?C, the rate of reaction increases _______ times?

For a ______ order reaction, the units of rate constant and rate of reaction are the same ?

For the gaseous reaction 2A ? B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is_____?

For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr ?

For a zero order reaction, the concentration of product increases with the _______?

For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the______?

For an autocatalytic reactor, the suitable reactor set up is___________?

For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction?

For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the _______ adsorption?

For a tubular reactor with space time ??? and residence time ???, the following statement holds good ?

For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor?

For high conversion in a highly exothermic solid catalysed reaction, use a _______ bed reactor?

Enzymes are destroyed, when the________?

For a zero order chemical reaction, the___________?

For a tubular flow reactor with uniform concentration and temperature, the independent variable is_____?

For a heterogeneous catalytic reaction______?

Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes ?

Exposure of a photographic plate to produce a latent image is an example of ________ reaction?

For the chemical reaction X ? Y, it is observed that, on doubling the concentration of ?X?, the reaction rate quadruples. If the reaction rate is proportional to Cx n, then what is the value of ?n? ?

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________?

For a reaction of the type of bellow given figure, the rate of reaction (- rx) is given by_____?

For multiple reactions, the flow pattern within the vessel affects the ______?

Equilibrium of a chemical reaction as viewed by kinetics is a _______ state?

For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?

For an ideal plug flow reactor, the value of Peclet number is________?

For the liquid phase zero order irreversible reaction A ? B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1. What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR ?

For a vapour phase catalytic reaction (A + B ? P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs) ?

For the liquid phase parallel reactions___________? R, rR = K1.CA2; E1 = 80 KJ/mole S, rs = K1.CA ; E2 = 120 KJ/mole The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at

Fluidised bed reactor is characterized by______?

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

For the chemical reaction P ? Q, it is found that the rate of reaction doubles as the concentration of ?P? is doubled. If the reaction rate is proportional to Cp n, then what is the value of ?n? for this chemical reaction ?

Exothermic reactions are best carried out in _________?

For identical flow rate, feed composition and for elementary first order reactions, ?N? equal sized mixed reactors in series with a total volume ?V? gives the same conversion as a single plug flow reactor of volume ?V? for constant density systems. This is true, when the value of ?N? 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________?

For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by ___________?

For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the ________ is the controlling resistance?

For a mixed flow reactor operating at steady state, the rate of reaction is given by_______?

For all positive reaction orders for a particular duty ?

Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in _____?

For a homogeneous reaction of nth order, the dimension of the rate constant is given by__________?

For any reaction, we may write conversion as a function of________?

For series reaction, the relative yield___________?

For a first order chemical reaction, the rate constant__________?

Find a mechanism that is consistent with the rate equation and reaction given below ? choiceno A 2A + B ? A2B, ( ? rA) = k.CA.CB