Question

what is the order of decomposition of ammonia on the surface of platinum ? Give another example having the same order

Answer 1

it's mentioned that at low pressure(7*10^-5 to 0.5 torr) reaction is of first order wrt NH3. However, as pressure increases, the coverage of surface increases and hence the decomposition also increases. So, at high pressures reaction follows zero order.

Example :
The Haber process is a well-known process used to manufacture ammonia from hydrogen and nitrogen gas.