Physical vs. Chemical Properties — Definition & Examples

Physical, because the solution doesn't change its chemical properties, as evidenced by the fact that testing the pH over and over again yields the same results.

Physical, because color is a physical property.

Chemical, because the indicator paper changes chemical identity when testing the solution, as evidenced by the fact that it changes color.

Chemical, because though the solution remaining in the container stays the same and can have its pH tested again, the solution that is absorbed into the paper has to react with it and change identity in order to change the paper's color.