In a reaction, the rate determining step (RDS) gives the order of reaction. There might be 2 or 3 molecules colliding to give a product (2nd or 3rd order) or a molecule breaks for order 1. But for zero order reactions, how do they occur? Are all zero order reactions complex (i.e. are there no simple 1 step zero order reactions )

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    $\begingroup$ Sorry, but I am not able to get the content of the first line. Could you possibly rewrite it? $\endgroup$ – William R. Ebenezer May 19 at 10:12
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    $\begingroup$ All reaction orders are one smaller if the rate-determining step involves a catalyst with constant, small concentration, so it becomes the limiting factor. $\endgroup$ – Karl May 19 at 16:53

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