Chemical Reaction Engineering
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is

Surface reaction between absorbed A and absorbed B
Desorption of C
Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
Surface reaction between A in the gas phase and absorbed B

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Chemical Reaction Engineering
Pick out the wrong statement pertaining to space velocity of flow reactors.

The unit of space velocity is (time)⁻¹
None of these
The space velocity of 3 hr⁻¹ means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour
The space velocity of 3 hr⁻¹ means that one third reactor volume of feed at specified conditions are being fed into the reactor

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Chemical Reaction Engineering
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Reaction is elementary but the molecularity may not be 2
Reaction may be elementary with molecularity of 2
Molecularity of the reaction is 2, but the reaction may not be elementary
Reaction is elementary with a molecularity of 2

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