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Question

A straight glass tube has 2 inlets, x and y at its two ends. HCl gas enters through inlet x and NH3 gas through inlet Y at the same time and under identical conditions. The gases meet at a point P somewhere in the middle of the 200 cm long tube. The distance of point P from x is:

A
118.9 cm
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B
81.1 cm
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C
91.1 cm
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D
108.9 cm
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Solution

The correct option is B 81.1 cm
Graham's law is what we will use here.
distance by HCldistance by NH3=rHClrNH3=MNH3MHCl=x200x
(as rate1m)
x200x=1736.5
1.465x=200xx=81.13 cm

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