Hydrogen is not toxic, but in its elemental form it is highly flammable. Mishandling it can result in an explosion.
NO. Hydrogen gas is non-toxic. However, it can displace oxygen (and if hot enough burn in it) and thus can be an asphynxant in large quantities. But hydrogen by it self is not toxic at all.
in pure quantities, yes. in general atmosphere, no.
A few highly toxic gasses include hydrogen cyanide (HCN), hydrogen fluoride (HF), carbon monoxide (CO) chlorine (Cl2), and fluorine (F2).
No. Hydrogen is not toxic.
At normal room temeratures and pressures, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible gas.
PbCN2. The lead(2+) cation and the cyanamide NCN(2-) anion.
Why would it preserve anything? Sodium sulphide is unstable in the presence of water and forms hydrogen sulphide gas - which is highly toxic and is the smell of bad eggs,
Hydrogen gas is non-toxic but it is highly flammable (or explosive) so it could easily cause you to burn to death; in addition, if you were to breathe pure hydrogen you would die in a few minutes from lack of oxygen.
Hydrogen and helium are generally considered non-toxic since they don't react with our bodies and are not harmful when inhaled or ingested in small amounts. Oxygen, on the other hand, is essential for human life and is not toxic in normal concentrations. However, excessively high levels of oxygen (such as in pure oxygen environments) can be toxic and potentially cause harm.
Arsenic is highly toxic and has the distinct odor of garlic. This is not to be confused with cyanide, which is toxic and has the odor of bitter almonds.
Chlorofluorocarbons (CFCs) are non-toxic.