Gas Physical Properties Test Result of test
Ammonia -          Colourless

-          Strong, pungent gas

 Use damp red litmus paper Turns red litmus paper to blue
Carbon dioxide -          Colourless

-          Odourless

 Bubble the gas through limewater Limewater turns milky/chalky
Chlorine -          Pungent, choking smelling gas

-          Pale, green gas

 Place a damp place of litmus paper in the gas Litmus paper is bleached
Hydrogen -          Colourless

-          Odourless

 Put a lighted wooden splint near the gas Gas burns with a pop sound
Oxygen -          Colourless

-          Odourless

 Put a glowing wooden splint near the gas Glowing splint relights / rekindles
Sulphur dioxide -          Colourless

-          Strong, pungent gas

 Dip a filter paper strip into potassium dichromate (VI) and then place it in the gas Orange potassium dichromate (VI) turns green