NON-METAL DON'T LIBERATE HYDROGEN WHILE REACTING WITH ACIDS.

Generally metal reacts with acid and hydrogen is released. B'coz metals are elctro-positive (having positive valency) so these can donate electron to hydrogen which is liberated as gas.  In contrast nonmetal are electronegative and hence they can't provide electron to the hydrogen. 

Zn + H₂⁺SO₄^2- → ZnSO₄ + H₂

        2H⁺ + 2e^- →  H₂