Question

why salt does not disolves in oil?

Answer 1

Oil molecules do not contain any charge. Oil is comprised of long chains of hydrogen and carbon atoms linked to each other. It does not contain any net charge making it nonreactive. So, salt and oil are not "chemically alike." One is charged, the other is not. As a result, when salt is added to oil, no bonds are broken. Salt and oil simply do not mix. When combined, they remain distinctly separate.