Question

At which point, A, B, C or D, does the white solid form? Explain why the white solid forms at that point

Answer 1

Answer:

A,B,C,D is a distance it is a chemistry questions in ncert book

Answer 2

The point at which the white solid forms is point A. The white solid forms at that point because it is closest to hydrochloric acid.

Explanation:

• Concentrated hydrochloric acid produces hydrogen chloride gas while concentrated ammonia solution produces ammonia gas.
• Both the colourless gases react together to form white-coloured ammonium chloride.
• The vapour density of ammonia gas is less than air while the vapour density of hydrogen chloride gas is more than air.
• As ammonia is a lighter gas, it moves towards hydrogen chloride by the process of diffusion.
• On the other hand, hydrogen chloride gas being denser does not move to a large distance.
• Therefore, the formation of ammonium chloride takes place near hydrochloric acid.
• Since point A is closest to hydrochloric acid, the white solid must form at point A.
• The reaction can be given as: $\[N{H_3} + HCl \to N{H_4}Cl\]$