Alist of five compounds potassium can form identify whether each compound is only naturally occurring, only human–made, or both naturally occurring and human–made

Potassium can form so many compounds.
I will write important ones which you will surely come across in future only if you take Chemistry

1. KMnO4

It is a widely used oxidising titrant. It acts as self indicator for end point detection and is a very strong oxidant.

2. KNO3

In galvanic cell, salt bridge(a U shaped glass tube filled with a concentrated solution of electrolyte usually KNO3) is used a bridge between two concentrated solutions.

3. KCl

Again same as 2 ^.^

4. KOH

It is alkaline in nature and can be easily formed in laboratory

5. K2S2O8

Alkaline potassium persulphate (K2S2O8) is used to oxidise monohydric phenols to dihydric phenols.