See the figure -1 : The valves of X and Y are opened simultaneously.The white fumes of NH4Cl will first form at :
A
A
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B
B
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C
C
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D
A,B and C simultaneously
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Solution
The correct option is BC According to Graham's law
Rate of Diffusion α1√Molecularweight
In both the gases HCl is heavier than NH3 and will diffuse less distance than NH3. Thus NH4Cl will first form near HCl and far from NH3 because in same time NH3 will diffuse double distance than HCl,