Question

A sol of $AgI$ is prepared by mixing equal volumes of $0.1M \, AgNO_3$ and $0.2M KI$, which of the following statement is correct ?

• A. Sol obtained is a negative sol with $NO^-_3$ adsorbed on $AgI$
• B. Sol obtained is a positive sol with $Ag^+$ adsorbed on $AgI$
• C. Sol obtained is a positive sol with $K^+$ adsorbed on $AgI$
• D. Sol obtained is a negative sol with $I^-$ adsorbed on $AgI$

Answer 1

Answer: (D)

Given reaction is,

$AgNO _{3}+ KI \rightarrow Agl ( Sol )+ KNO _{3}$

Here, the amount of $AgNO _{3}$ present is $0.1 \,M$.

Amount of $KI$ present is $0.2\, M$.

Since $KI$ is excess here, thus, sol obtained is a negative sol with $I$ adsorbed on $AgI$.