In a glass tube of uniform cross section, a mixture of and He gases are sent from one end and a mixture of and Ar gases are sent from the another end, at the same time. The white fumes of will appear

Question

In a glass tube of uniform cross section, a mixture of $HCl$ and He gases are sent from one end and a mixture of $NH_3$ and Ar gases are sent from the another end, at the same time. The white fumes of $NH_4Cl$ will appear first

Prashant Kotian · Accepted Answer

Correct answer: C. nh3 is lighter (m=17) than hcl (m=36.5). usually, white fumes of nh4cl form closer to the heavier gas (hcl end). the presence of he (m=4) and ar (m=40) affects average speeds, but the chemical reaction requires the collision of nh3 and hcl molecules. since nh3 molecules are lighter and diffuse faster, they travel farther along the tube, forming nh4cl closer to the hcl injection end.

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