Question

The most suitable electrolyte for the coagulation of arsenic sulphide will be :

• A. $AlC{l}_3$
• B. $BaC{l}_2$
• C. $NaCl$
• D. $KCl$

Answer 1

Answer: (A)

$AlC{l}_3$

$A{s}_2{S}_3$ solution is negatively charged solution hence it can be coagulated by a positively charged electrolyte like $AlC{l}_3$.

As the charge on $A{l}^{3+}$ is highest so $A{l}^{3+}$ is a better coagulating agent as compared to $N{a}^{+}$ and $K^{+}$.

Option A is correct.