Question

In a $2m$ long narrow tube, $HCl$ is allowed to diffuse in the tube from one end and $N{H}_3$ from the other end. If diffusion is started at the same time, predict at what point the white fumes of $N{H}_{4}Cl$ will form?

• A. $1.22m$
• B. $1.78m$
• C. $2.0m$
• D. $1.55m$

Answer 1

The correct option is A $1.22m$

Let at $x$ distance(from $HCl$ end), $N{H}_{4}Cl$ is formed, applying Graham's law of diffusion,

$\frac{x}{2-x}=\sqrt{\frac{17}{36.5}}$

$x=(2-x)\times 0.682$

$1.682x=1.365$

$x=0.811m$

Hence, the correct option is $\text{A}$