Pepper is not soluble in water because water is a very polar and the components of pepper are non-polar; very fine powder of pepper can be mixed with water. forming an unstable suspension, but cannot be dissolved.

Pepper and water is not a solution, it is a mixture because the pepper will not dissolve.

If you're wondering if salt and water is a solution, it is because it's the solution saltwater and the salt does dissolve unlike the pepper.

It can't because of the solid particles of the pepper. This mixture is called a suspension.

Pepper will not dissolve in water.

No water soluble pepper is already organic.