Inorganic acids and other inorganic oxygen compounds of non-metals; n.e.c. in heading no. 2806 to 2810

281111 Hydrogen fluoride (hydrofluoric acid) 281112 Hydrogen cyanide (hydrocyanic acid) 281119 Inorganic acids; other than hydrogen fluoride 281121 Carbon dioxide 281122 Silicon dioxide 281129 Inorganic oxygen compounds; of non-metals, n.e.c. in item no. 2811.2