A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long uniform tube — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

Lighter gases diffuse faster ($r \propto 1/\sqrt{M}$). Since $NH_3$ ($17\text{ g/mol}$) is lighter than $HCl$ ($36.5\text{ g/mol}$), ammonia travels further down the tube in the same time, making the ring form closer to the slower $HCl$ source.