Arsenic trioxide is the principal merchandise of arsenic smelters. This oxide has direct programs in business—e.g., as being a glass decolorizing agent. Other commercially helpful organic and inorganic arsenic derivatives are organized from it. In the processing of As2O3 the oxide is Generally lessened withcarbon: 2As2O3+3C?→As4+3CO2 The reaction is endothermic http://https//chemscenter.com