`NH_(4)Cl(s)` is heated in test tube.Vapours are brought in contract with red litmus paper, which changes to blue and then to red.It is because of :

Options

A. formation of `NH_(4)OH` and `HCl`
B. formation of `NH_(3)` and `HCl`
C. greater diffusion of `NH_(3)` than `HCl`
D. greater diffusion of `HCl` than `NH_(3)`

Answer

C

Explanation

Order of the rate of diffusion `NH_(3) gt HCl`.
`r prop 1/sqrtM` , where `r`=rate of diffusion and `M`=molecular weight