Question

NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, which changes to blue and then to red. It is because of :

• A. Formation of NH4OH and HCl
• B. Formation of NH3 and HCl
• C. Greater diffusion of NH3 than HCl
• D. Greater diffusion of HCl than NH3

Answer 1

Answer: (C)

Greater diffusion of NH3 than HCl

Answer 2

Order of the rate of diffusion NH3 > HCl.

$r \propto \frac{1}{\sqrt{M}}$ where r = rate of diffusion and M = molecular weight