Question

$X$ and $Y$ are two volatile liquids with molar weights of $10gmo{l}^{-1}$ and $40gmo{l}^{-1}$ respectively. Two cotton plugs are soaked in $X$ and other soaked in $Y$ are simultaneously placed at the ends of a tube of length $L=24cm$, as shown in the figure. The tube is filled with an inert gas at $1atm$ pressure and temperature of $300K$. The vapour of $X$ and $Y$ react to form a product which is first observed at a distance $dcm$ from the plug soaked in $X$. Take $X$ and $Y$ to have equal molecular diameters and assume ideal behaviour for the inert gas and the two vapours.
The value of $d$ in $cm$ as estimated from Graham's law is:

• A. $8$
• B. $12$
• C. $16$
• D. $20$

Answer 1

The correct option is C $16$

Option C is correct.