Question

Which one of the following processes produces a decrease in the entropy of the system?a, precipitation of AgCl(s) from Ag+(aq) and Cl−(aq) ions in solutionb. dissolution of LiOH(s) in waterc. melting solid gold into liquid goldd. evaporation of Hg(l) to form Hg(g)e. mixing of two gases into one container SubmitGive Up Continue

Answer 1

Answer:  precipitation of $AgCl(s)$ from $Ag^+(aq)$ and $Cl^-(aq)$ ions in solution

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from  an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

a) precipitation of $AgCl(s)$ from $Ag^+(aq)$ and $Cl^-(aq)$ ions in solution : As ions are getting solidified, entropy decreases.

b) dissolution of $LiOH(s)$ in water: The compounds dissociates into ions, entropy increases.

c) melting solid gold into liquid gold: The randomness increases, entropy increases.

d) evaporation of Hg(l) to form Hg(g) : The randomness increases, entropy increases.

e)  mixing of two gases into one container : The randomness increases, entropy increases.