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

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Chemical Reaction Engineering
For a zero order chemical reaction, the

Half life period is directly proportion to the initial concentration of the reac-tants
All of these
Products concentration increases linerarly with time
Plot of products concentration with time is a straight line through the origin

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

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

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