First slide
Types of chemical reactions
Question

2NH3gPt1130K,HighPN2g+3H2g   This reaction is an example of

Easy
Solution

At high pressure metal surface is saturated with gas molecules. 

So further change in reaction conditions is unable to alter the amount of ammonia on the surface of catalyst;
 rate is independent of concentration changes of  NH3;

It is a zero order reaction

 

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