Which is/are NOT an example(s) of heterogeneous catalysis?

• A. Hydrolysis in an aqueous solution.
• B. An aqueous reaction with a solid palladium catalyst.
• C. A reaction set-up composed of an aqueous and organic layer.
• D. The reaction of acetylene gas with hydrogen gas on the surface of nickel.
• E. Formation of ammonia gas on metal catalyst.
• F. none of the above
• G. b and e
• H. a and c
• I. c and e

Answer: (H)