Question

The kinetic order for the following reaction is ________. 
\[\ce{2N_2O_(g) ->[Pt] 2N_2_(g) + O_2_(g) }\]

Options

• zero 

• first

• second

• third

Answer 1

The kinetic order for the following reaction is zero. 

The decomposition of N₂O on platinum surface follows zero order kinetics. Most of the N₂O molecules (which remain in gaseous phase) are unreactive while those which occupy all the active sites on metal surface take part in reaction. Thus, the reaction rate is independent of total concentration of N₂O.