Question

`H_2SO_3 (aq) -> H_2O (l) + SO_2 (g)` is what type of reaction?

Answer 1

I'd say decomposition reaction.

Explanation:

In a decomposition reaction, a substance splits into smaller molecules.

So here, we got the reaction:

`H_2SO_3(aq)->H_2O(l)+SO_2(g)`

And so, the bigger molecule `(H_2SO_3)` is split into two smaller molecules, water `(H_2O)` and sulfur dioxide `(SO_2)`.