If you rin electricity through water mixed with salt and collect the gas bubbles, is that O2 or H?

Answer 1

Any bubbles would probably be from the salt.
Assuming by salt you mean sodium chloride, it would electrolyse to form sodium and chlorine. You would get bubbles of chlorine gas being given off at the positive electrode.
At the negative electrode, the sodium would react with the water to produce sodium hydroxide and some H2 would be produced.

Answer 2

You get both O2 and H2, and,
(if you use too much voltage),
some Cl2 as well.
Now, additional homework questions:
At which electrode do you get which gases?
Where will you see the Na from the salt?
What will happen to the Na on contact with water?

Caution: If you mix the gases, or use
alternating current you will have an
explosive easily ignitable mixture of gases.