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Question

NH3 and HCl gas are introduced simultaneously from the two ends of a long tube. A white ring of NH4Cl appears first :

A
nearer to the HCl end
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B
at the center of the tube
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C
throughout the tube
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D
nearer to the NH3 end
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Solution

The correct option is A nearer to the HCl end
A white ring of NH4Cl appears first nearer to the HCl end. The rate of diffusion is inversely proportional to square root of molar mass. The molar mass of HCl (36.5 g/mol) is higher than the molar mass of ammonia (17 g/mol). Hence, the rate of diffusion of ammonia is higher than the rate of diffusion of HCl.
Hence, option A is correct.

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