o2 is a physical quality for space oil
o_2 is not inorganic_substance. o2_2 is not inorganic_substance. o_2 is inorganic_substance. o_2 is not base. o_2 is oxygen. n2 is gas. o2_2 is inorganic_substance. o_2 is not oxygen. o_2 is base. h2 is gas.