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.

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

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Chemical Reaction Engineering
In the reversible reaction of the type, A + B ⇋ AB, in general

Neither of the reactions will be en-dothermic
Both forward and backward reactions will be exothermic
The combination reaction will be endothermic, while the dissociation reaction will be exothermic
The combination reaction will be exothermic, while the dissociation reaction will be endothermic

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