What type of catalyst is each of these

-potassium iodide solution
-solid manganese dioxide
-solid contact lens cleaning disk
-potato

The different ttypes of catalysts are enzyme, heterogeneous, homogeneous, and sit.

This is hard to tell.

The enzyme is likely the potato
The homogeneous is likely the potassium iodide solution but it depends on what it is put in with.
The manganese dioxide is in its solid form so if it is put in with a gas or liquid, it is a heterogeneous catalyst. Most often it is.

The last one is sit and I do not know what that is. The only one left is the solid contact lens cleaning disc.