… Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds …
Explanatory notes
… 28.50 ‑ Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds … antimony, nickel, titanium, zirconium, tin, lead, etc. This heading does not include compounds of hydrogen … action of nitrous oxide on sodium amide, or from hydrazine, ethyl nitrite and sodium hydroxide; colourless crystalline …