Question

An example of a zero order reaction is

• A. acid hydrolysis of methylacetate
• B. saponification of an ester
• C. decomposition of HI on? the surface of gold at high temperature
• D. decomposition of $H_2O_2$

Answer 1

Answer: (C)

decomposition of HI on? the surface of gold at high temperature

Answer 2

Reactions occurring on metal surfaces are zero order reactions. The concentration of the gaseous reactant on the metal surface remains constant because as the reactants react off on the surface, more molecuies are adsorbed on the surface. Hence, rate remains constant throughout.