p-Block elementsHard

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 :

Options

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

Solution

Order of the rate of diffusion NH3 > HCl.
r ∞     where r = rate of diffusion and M = molecular weight

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