1. The acid would have to be impossibly strong. He would just swim to the bottom or side and push him self out. There is no acid that is strong enough to kill him quick enough. Apart from the stuff that was used by some aliens that could melt through collosuses armour and nearly killed him.
2. Depends how angry he is and how hot the lava is but in nearly every scenario he would survive.
3. Depends how hot it is but i think he could probably make it out unless it seeped down his throat and into his lungs and stuff then went hard cause then he wouldn't be able to heal because he would just die again.
A nearly full proof way way to kill him is to hit him into the sun. I know that if some one like Thor could just hit him upwards then then fly up as fast as he could he could ram into him and propel him into the sun. Because hulk cant fly and there is basically nothing in space for hulk to slow him self with a kid with a BB gun could shoot him while flying through space and hulk would never stop moving.
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