Explanatory notes
… obtained by passing oxygen and sulphur dioxide over a catalyst (platinum, ferric oxide, vanadium pentoxide, etc.). … sulphide or ammonium sulphide. Sulphuric acid is a very strong corrosive. It is a dense, oily liquid, colourless (if … 4 . It is presented in containers or carboys of glass, in steel drums, tank trucks, railway tank wagons or tank ships. …