Hydrogen in not a 'toxic' gas, however if you breath air that has a very high concentration of hydrogen you would asphyxiate by starving your body of oxygen.
Yes. Molecular hydrogen is highly flammable.
If you chuck it at people... If you burn it... If you inhale coal dust... Lots of ways :)
Plutonium is a solid in its natural phase, so you really couldn't inhale it unless you vaporized it, or if you inhale the dust. Then it would be dangerous, considering that plutonium is radioactive, though only mildly toxic, as it will accumulate in the bone marrow.
hydrogen
No, it's dangerous to inhale. A weak ammonia solution is better.
Yes, Bee Killer is dangerous to inhale.
I aldehyde dangerous to inhale
Not necessarily; Unless you inhale a lot, you will survive.
Yes
YES! do not ingest/inhale it!
Yes.
if you inhale it to much it can give you a infection
Toxity
Hydrogen is dangerous than Helium because Hydrogen is a stronger gas than Helium.
yes very only if you inhale it though it depends
Yes it is dangerous for your health. It can end your health through asphyxiation.
Yes. Molecular hydrogen is highly flammable.