Hydrogen sulfide

H2S, colorless, smelly egg smell gas, can lead acetate (PbAc2) test paper black

 

Ammonia

NH3, colorless pungent odor, can make the glass stick with concentrated hydrochloric acid production of white smoke. The red litmus paper can make wet blue.

 

Nitric oxide

NO, a colorless gas, open the bottle in contact with air, immediately turn brown gas.

 

Nitrogen dioxide

NO2, red brown, pungent odor, soluble in water and reaction. The soluble in water, but can make the solution colorless purple litmus red. Can make the wet starch KI paper blue.

 

Methane

CH4, colorless and tasteless, light, for the light blue flame, the product of carbon monoxide and carbon dioxide.

 

Ethylene

C2H4, colorless, light, flame bright, a little black smoke. It can make water or acidic solution of KMnO4 bleaching.

 

Acetylene

C2H2, colorless and tasteless, light, flame bright, there are a lot of black smoke. It can make water or acidic solution of KMnO4 bleaching.

 

Hydrogen

H2, colorless, tasteless gas, with the reduction of. The air in the combustion flame was blue, a popping sound, produced only in the water.

 

Oxygen

O2, a colorless, odorless gas, wood inspection with Mars, the resurgence of wood.

 

Chlorine

Cl2, yellow green, pungent odor, soluble in water, bleaching, oxidation. And ozone, nitrogen dioxide as the starch iodide paper wet blue

 

Hydrogen chloride gas

HCl, colorless gas with a pungent odor, the formation of fog in the humid air. The glass rod with thick ammonia gas can be produced with white smoke. The wet blue litmus paper red. A small amount of silver nitrate and dilute nitric acid were added into the gas collecting bottle to produce white precipitation.

 

Carbon dioxide

CO2, colorless and tasteless gas, through the clarification of the white lime water precipitation, lime water turbidity.

 

Sulfur dioxide

SO2, a colorless pungent odor, the fuchsin red receded, reheating. Red again, can make acid Potassium Permanganate solution fade.