28: Inorgn chem; compds of prec met, radioact elements etc

2801: Fluorine, chlorine, bromine and iodine 2802: Sulphur, sublimed or precipitated; colloidal sulphur 2803: Carbon (carbon blacks & other forms of carbon, nes) 2804: Hydrogen, rare gases & other non-metals 2805: Alkali/alkaline-earth metal; rareearth metal, scandium & yttrium; mer 2806: Hydrogen chloride (hydrochloric acid); chlorosulphuric acid 2807: Sulphuric acid; oleum 2808: Nitric acid; sulphonitric acids 2809: Diphosphorus pentaoxide; phosphoric acid and polyphosphoric acids 2810: oxides of boron; boric acids 2811: Inorganic acids, nes & other inorganic oxygen compounds of non-metals 2812: Halides and halide oxides of non-metals 2813: Sulphides of non-metals; commercial phosphorus trisulphide 2814: Ammonia, anhydrous or in aqueous solution 2815: Hydroxid, sodium (caustic soda) & caustic potash; peroxide of sod & p 2816: Hydroxid & peroxid of magnesium; oxid, hydroxid & peroxid strontium & 2817: Zinc oxide; zinc peroxide 2818: Aluminium oxide (incl artificial corundum); aluminium hydroxide 2819: Chromium oxides and hydroxides 2820: Manganese oxides 2821: Iron oxid & hydroxid; earth col ctg>/=70% by wt combi iron as FE2o3 2822: Cobalt oxides and hydroxides; commercial cobalt oxides 2823: Titanium oxides 2824: Lead oxides; red lead and orange lead 2825: Hydrazin, hydroxylamin...; o inorgn base; o met oxid, hydroxid & pero 2826: Fluorides; fluorosilicate, fluoraluminates & other complex fluorine s 2827: Chlorides, bromides, iodides & their oxides; chloride hydroxides 2828: Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromid 2829: Chlorates & perchlorates; bromates & perbromates; iodates & periodate 2830: Sulphides; polysulphides 2831: Dithionites snd sulphoxylates 2832: Sulphites; thiosulphates 2833: Sulphates; alums; peroxosulphates (persulphates) 2834: Nitrites; nitrates 2835: Phosphinat(hypophosphit)phosphonat (phosphit), phosphat & polyphosph 2836: Carbonat; peroxocarbonat commerc ammon carb cntg ammon carbam 2837: Cyanides, cyanide oxides and complex cyanides 2838: Fulminates, cyanates and thiocyanates 2839: Silicates; commercial alkali metal silicates 2840: Borates; peroxoborates (perborates) 2841: Salts of oxometallic or peroxometallic acids 2842: Salts of inorganic acids or peroxoacids nes, excluding azides 2843: Colloidal prec met; prec met compds nes; amalgams of precious metals 2844: Radioactive chem elements & isotopes, their compounds, mixtures & res 2845: Isotopes, nes and their compounds 2846: Compounds of rare-earth metals nes, of yttrium/scandium/mx of these m 2847: Hydrogen peroxide, whether or not solidified with urea 2848: Phosphides, whether/not chemically defined, excluding ferrophosphorus 2849: Carbides, whether or not chemically defined 2850: Hydrides, nitrides, azides, silicides & borides w/n chemically define 2851: Inorganic compound ne; liquid & compr air, amalgam o/t amalgam of pre 28: Inorgn chem; compds of prec met, radioact elements etc