State the composition of clean, dry air as approximately 78% nitrogen, ( N_2 ), 21% oxygen, ( O_2 ) and the remainder as a mixture of noble gases and carbon dioxide, ( CO_2 )

Describe and explain the effect of relative molecular mass on the rate of diffusion of gases

Describe tests to identify the gases: (a) ammonia, ( NH_3 ), using damp red litmus paper (b) carbon dioxide, ( CO_2 ), using limewater (c) chlorine, ( Cl_2 ), using damp litmus paper (d) hydrogen, ( H_2 ), using a lighted splint (e) oxygen, ( O_2 ), using a glowing splint (f) sulfur dioxide, ( SO_2 ), using acidified aqueous potassium manganate(VII)