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

Hydrolysis in an aqueous solution.

An aqueous reaction with a solid palladium catalyst.

A reaction set-up composed of an aqueous and organic layer.

The reaction of acetylene gas with hydrogen gas on the surface of nickel.

Formation of ammonia gas on metal catalyst.

none of the above

b and e

a and c

c and e