For a heterogeneous 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______________________?
(A) Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
(B) Surface reaction between absorbed A and absorbed B
(C) Surface reaction between A in the gas phase and absorbed B
(D) Desorption of C
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