HCl in gaseous state, is not an acid.
H2SO4 is not a strong oxidiser. To oxidise, it must be reduced. And to what can it be reduced? from S6+ to S4+? now thats very hard, since you need to reverse the spontaneous reaction of formation of SO4. well i dont know much about sulfur, but sulfuric acid is not a strong oxidiser.
the acids are not really liquids, they are simply compounds in aqueous state, just like aqueous HCl as opposed to gaseous HCl.
Last statement seems alright, HNO3 is the strongest oxidiser of them all, and metals are more easily oxidised than reduced.