Question

what is homogeneous and heterogeneous activity and selectivity

Answer 1

homogeneous mixture : a mixture containing same element(metal-metal or non metal -non metal) like alloy.
hetrogeneous mixture: a mixture containing two different elements like metal and a non metal.

Answer 2

The terms h​eterogeneous and homogeneous refer to mixtures of materials in chemistry. The difference between heterogeneous and homogenous mixtures is the degree at which the materials are mixed together and the uniformity of their composition. The composition of the mixture is the same throughout.
hope it helps
mark as brainliest