What is a non polarized capacitor?

In all likelihood, yes. But it will most likely be more expensive to do so - you need to match the same size, and voltage rating.

You don't. A polarized capacitor is inherently polarized due to how it is made. If you need a non polarized capacitor, buy a non polarized capacitor.

A polarized capacitor uses a special form of dielectric that only allows charge in one direction. A non-polarized capacitor does not have that restriction. The advantage of a polarized capacitor is...

Take two electrolytic capacitors of the same voltage and capacity, connect the positive leads together and connect the negative leads to the circuit. Just keep in mind that this will reduce the cap....

Yes, you can connect a polarized capacitor to a direct current. Make sure you get your polarization is correct. A non polarized capacitor can be connected in a DC circuit as well. "Non Polarized"...