`NH_(3) and HCl` gas are introduced simultaneously from the two ends of a long tube. A white ring of `NH_(3)Cl` appears first

Options

A. A) nearer to the HCl end
B. B) at the centre of the tube
C. C) throughout the tube
D. D) nearer to the `NH_(3)` end

Answer

A

Explanation

According to Graham.s law of diffusion
`(r_(1))/(r_(2))=sqrt((d_(2))/(d_(1)))=sqrt((m_(2))/(m_(1))),(r_(NH_(3)))/(r_(HCl))=sqrt((36.7)/(17))`
Hence rate of diffusion of `NH_(3)` is more than HCl. This means `NH_(3)` reach first to HCl end. hence white ring of `NH_(4)Cl` appears first at HCl end.