For which of the following aqueous salts will electrolysis produce hydrogen gas and oxygen gas? Answered the hint in Mastering Chem & looked over the book and I still have no idea.

Question

Check all that apply:
A) NiF_2(aq)
B) NaF(aq)
C) NiI_2(aq)
D) NaI(aq)
E) CuBr(aq)

Answer 1

You get H2 from all but E.
You get oxygen from A and B.

Answer 2

Turns out the correct answer was just B) NaF(aq)

Answer 3

Is this class beginning chemistry? I did not think freshman chemistry would be discussing hydrogen/metal over potential.

Answer 4

So is B correct, can someone explain