analysis of gases

1. if in a colorless, odorless gas a glowing wood splint starts to glow extra clearly, then this gas must be oxygen.
2. Carbon dioxyde makes lime water trouble, because calcium carbonate is produced.
3. If a gas turns white Led acetate paper into black, then that gas is probably Hydrogensulfide (3) (and probably you did already smell it).
4. Ammonia gas will color a red litmus paper to blue, or gives with HCl(g) a white smoke.
5. If a gas decolors Bromine water or Iodine solution, then this gas must be a reducing gas (for example SO₂) but: it can also indicate addition, and then the gas was a small and unsaturated compound.
6. A number of ases are inflamable, like Hydrogen and Hydrocarbons.