When two cotton plugs, one moistened with ammonia and the other with hydrochloric acid, are sumulataneously inserted into opposite ends of a glass tube 87.0 cm long, a white ring of `NH_(4)Cl` forms where gaseous `NH_(3)` and gaseous HCl first come into contact.
`NH_(3)(g)+HCl(g)rarrNH_(4)Cl(s)`
At what distance from the ammonis-moistened plug does this occur?

Options

A. 51.7 cm from `NH_(3)` end
B. 51.7 cm from HCl end
C. 43.5 at mid point
D. None of these

Answer

a

Explanation

(a) `(r_(NH_(3)))/(r_(HCl))=sqrt((36.5)/(17))=(x)/(87.5-x)`

`x=51.7cm`