Explanatory notes
β¦ acid) (H 3 PO 2 ). Lamellar crystals, melting at about 25Β Β°C, oxidising on exposure to air; a powerful reducing β¦ silica, e.g. quartz and diatomaceous earth ( Chapter 25 , except varieties constituting precious or semi-precious β¦ antimonic acid and antimony oxides fall in headingΒ 28.25 . ______________________ ( *)Β In the following order: β¦