What gas is present when combining CuSO4+ Zn?

There are two reactions occurring in the reaction mixture.

The first one is displacement reaction in which zinc displaces copper from the copper(II) sulfate solution.
Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s)
Zinc dissolves and reddish precipitate of copper is formed.

The second reaction is the one between zinc and water to form hydrogen gas. The reaction rate is very slow and is practical impossible. In the presence of copper(II) ions as catalyst, the reaction undergoes in a steady rate.
2Zn(s) + 2H₂O(l) → Zn(OH)₂(s) + H₂(g) …… (Cu²⁺ ions as catalyst)
The bubbles are hydrogen gas.

Gas???

Zn(s) + CuSO4(aq) --> ZnSO4(aq) + Cu(s)

If you did this single replacement reaction in a container open to the atmosphere there would be O2 and N2 present in the air, but they wouldn't have anything to do with the reaction.

I did the lab
When zinc was added, there was fizz in the beaker. There was also a white gas that was emitted.
so there was H2SO4 because when H2SO4 was added, the excess zinc began to dissolve. The solution turned a foggy white color, and then cleared up. At the bottom of the beaker, there was a redish ppt.