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

ANSWER DOWNLOAD EXAMIANS APP

Chemical Reaction Engineering
A space time of 3 hours for a flow reactor means that

It takes three hours to dump the entire volume of the reactor with feed
Conversion is cent per cent after three hours
Three reactor volumes of feed can be processed every hour
The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours

ANSWER DOWNLOAD EXAMIANS APP