A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends, the white ammonium chloride ring first formed will be :

Let us see the reaction of ammonia and hydrochloride gas. 3 4 (White ppt) NH HCl NH Cl -> Gaseous State 13 Due to formation of 4 NH Cl , there is creation of white ring in the tube. HCl diffuse slower than 3 NH because mass of HCl is more than 3 NH . Since Graham’s law 1 2 2 1 r m = r m Therefore NH3 will travel more distance than HCl at the same time interval and the gas will meet first nearer to HCl end and white ring will be formed.