Is a white snake dangerous

Answered in parts as it is easier:

1. There are no snakes (that I know of) on the planet that are naturally white, there are genetic aberrations known as albino's - and that can happen in any snake breed. So color is not an identifier of what kind of snake this is (or may have been).
2. All snakes are potentially dangerous, depending on what type it is, and how it is dealt with; even the smallest can have nasty bites and non-venomous snakes is a misnomer as they may not have venom but most have bacteria that can prove just as, if not more, fatal.
3. You should never deal with a snake unless you know what you are doing, or, you are supervised by someone else that does.