Question

Take two gas jars A & B. Take H2 in jar A & CO2 in B. Invert the two gas jars one over the other. After a few minutes which gas will be found in A & B?

Answer 1

both will mix up and spread equally in both jars

Answer 2

gases always forms homogenous mixtures irrespective of colour ; nature etc.... For example air ( it is a homogenous mixture of many gases) . homogenous means uniform composition. from above information we can say both jars contain a homogenous mixture of CO2 and H2