Question

Question #9b62e

Answer 1

Here the molecularity of the reaction is 2 ,which is theoretical .
But this reaction seems to be a complex one. In its rate determining step rate should be independent of concentration of `NH_3` as per the rate equation.So its order is zero

For details please click here
http://chem-guide.blogspot.in/2010/04/order-and-molecularity-of-reaction.html