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  4. Two gases, ammonia and hydrogen chloride, are passed in a long glass tube from opposite ends. The white ring will be formed at:

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Q. Two gases, ammonia and hydrogen chloride, are passed in a long glass tube from opposite ends. The white ring will be formed at:

JIPMERJIPMER 1995

Solution:

Molecular w.t. of $ N{{H}_{3}}=14+3=17 $ Molecular w.t. of $ HCl=35.5+1=36.5 $ According to Grahams law: $ r\propto \frac{1}{\sqrt{M}} $ Hence, the rate of diffusion will be higher for ammonia as it is lighter than $ HCl. $ Hence, white ring of $ N{{H}_{4}}Cl $ will be formed nearer to $ HCl $ end.