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(B) According to Graham's Law of Diffusion,the rate of diffusion $r \propto \frac{1}{\sqrt{M}}$,where $M$ is the molar mass of the gas.The molar mass

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near the hydrogen chloride bottle

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(B) According to Graham's Law of Diffusion,the rate of diffusion $r \propto \frac{1}{\sqrt{M}}$,where $M$ is the molar mass of the gas.The molar mass of $NH_3$ is $17 \ g/mol$ and the molar mass of $HCl$ is $36.5 \ g/mol$.Since $M_{HCl} > M_{NH_3}$,the rate of diffusion of $NH_3$ is faster than that of $HCl$.Therefore,the $NH_3$ gas travels a greater distance in the same amount of time,and the white ring of $NH_4Cl$ is formed closer to the $HCl$ bottle.

$A$ 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:

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