A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be

Options

A. at the centre of the tube
B. near the hydrogen chloride bottle
C. near the ammonia bottle
D. throughout the length of the tube

Answer

B

Explanation

Mol. Mass of `NH_(3) = 17`,
Mol. Mass of `HCl = 36.5`
Rate of diffusion, `r prop sqrt((1)/("Mol. Mass"))`
`:. NH_(3)` will diffuse faster than HCl.
`:. NH_(3)` vapour will travel a longer distance than HCl vapour in same time.
`:.` Ring formed will be nearer HCl bottle