Chemical Reaction Engineering
The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.

Absorption of A
Surface reaction between absorbed A and absorbed B
Surface reaction between A in the gas phase and absorbed B
Surface reaction between absorbed A and B in the gas phase

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Chemical Reaction Engineering
In Langmuir treatment of adsorption,

Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site
Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
Extent of adsorption is more than one complete monomolecular layer on the surface
All the adsorption does not take place by the same mechanism

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Chemical Reaction Engineering
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

Fast reactions in catalyst of small pore diameter
Slow reactions in catalyst of large pore diameter
Slow reactions in catalyst of small pore diameter
Fast reaction in catalyst of large pore diameter

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