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.Management Sciences
Category: Chemical Reaction
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) ?
A. E
B. E + ΔHA
C. E + ΔHA – ΔHR)
D. ΔHA + ΔHR
BET apparatus_______________________?
A. Measures the catalyst surface area directly
B. Operates at very high pressure
C. Is made entirely of stainless steel
D. None of these
In a/an ______________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation?
A. Adiabatic
B. Isothermal
C. Non-adiabatic
D. None of these
In a zero order reaction, reactants concentration does not change with time and the_________________?
A. Time for half change is half the time taken for completion of the reaction
B. Time for half change is independent of the initial concentration
C. Time for completion of the reaction is independent of the initial concentration
D. Reaction rate is trebled when the initial concentration is trebled
For a _____________ order reaction, the units of rate constant and rate of reaction are the same ?
A. Zero
B. First
C. Second
D. Fractional
Space velocity____________________?
A. Describes the extensive operating characteristics of a tubular flow reactor
B. Is the maximum feed rate per unit volume of reactor for a given conversion
C. Is a measure of the ease of the reaction
D. All A., B. and C.
Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature ?
A. Pore diffusion
B. Film diffusion
C. Ash layer diffusion
D. Chemical reaction
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