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

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Chemical Reaction Engineering
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

None of these
Temperature should be high in the beginning and decreased towards the end of the reaction
Very high temperature should be used throughout the reaction
Very low temperature should be used throughout the reaction

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Of very large activation energy of many bodies
Of requirement of very large concentration for such reactions
Many body collisions are not favoured energetically
Of low probability of many body collisions

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