Colourless gases

         (i)  Tests for CO₂ : It is colourless and odourless gas. It provides white ppt. with lime water which dissolves on passing excess of CO₂

         (ii) Test for CO :  It is odourless and colourless gas. It burns with a blue flame.

         (iii) Test for O₂ : It is odourless and colourless gas. It rekindles a shining splinter.

         (iv) Tests for H₂S : It is a colourless gas with a smell of rotten eggs. It turns moist lead acetate paper black.

         (v) Tests for SO₂ : It is a colourless gas with a suffocating odour of burning sulphur. It turns acidified K₂Cr₂O₇ solution green.

(vi) Tests for NH₃ : It is a colourless gas with a characteristic ammonical smell. It gives white fumes of NH₄Cl with HCl,

.

With Nessler's reagents, it gives brown ppt.

         It provides deep blue colour with CuSO₄ solution,

dissolves in water to give NH₄OH which being basic, converts red litmus blue,

.

   (vii) Tests for HCl gas : It is colourless gas with a pungent irritating smell.  It turns moist blue litmus paper red i.e., it is acidic in nature. It gives white ppt. with AgNO₃ solution. This white ppt. is soluble in

.

(viii) Test for CH₃COOH vapours : These vapours are colourless with a vinegar like smell. 

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