In the shown experiment (Fig. 1) the litmus paper will initially
- be bleached
- turn green
- turn red
-
turn blue
The correct answer is: D
Explanation
\(NH_4Cl → NH_3 + HCl\). rate of diffusion of substances depends too on their molar mass, the smaller the molar mass of a substance the faster the rate of diffusion of that substance. so the litmus paper initially turns blue because ammonia will get to it first since it diffuses faster than HCl.
There is an explanation video available .