most important arsenic compounds
The most important compounds of arsenic are arsenic (III) oxide, As 2 O 3, (' white arsenic '), the yellow sulfide orpiment (As 2 S 3) and red realgar (As 4 S 4), Paris Green, calcium arsenate, and lead hydrogen arsenate.The latter three have been used as agricultural insecticides and poisons.he most common oxidation states for arsenic are -3 (arsenides: usually alloy-like intermetallic compounds), +3 (arsenates(III) or arsenites, and most organoarsenic compounds), and +5 (arsenates(V): the most stable inorganic arsenic oxycompounds).