Question

Ammonia, $M_r=17$ and hydrogen chloride, $M_r=36.5$ diffuse in the tube shown.When these gases meet, they produce a white cloud of ammonium chloride.Where in the tube does the white cloud first appear?

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is A A

We know from graham's law distance traveled $\alpha \frac{1}{\sqrt{molecularwt.}}$

Here $HCl$ has more weight hence forms are formed nearer to $HCl$ than ${NH}_3$.

Hence possible location is 'D'.