Can polar and a non polar molecules mix?

Yes. Polar and Non-polar are gradual. For instance, for a bond, an electronegativity difference >1.7 is called ionic, and less than 1.7 is called non-ionic. But the difference is 51% bond polarity versus 50% bond polarity!!

There are London Dispersion Forces (a subset of van der Waals forces) which will always cause molecules to be attracted to each other. The lower the temperature the stronger the attraction. This even applies to helium, which can be condensed into a liquid at 4.2K.

substances that are polar and mix with water are a. hydrolied b. solutes c.hydrophilic d. hydrophobic