A solution may contain any of the Group III cations. Treatment of the solution
with ClO \(^{-}\) in alkaline medium yields a yellow solution and a colored
precipitate. The acidified solution is unaffected by treatment with
\(\mathrm{NH}_{3}\). The colored precipitate dissolves in nitric acid; addition
of excess \(\mathrm{NH}_{3}\) to this acidic solution produces only a blue
solution. On the basis of this information, which Group III cations are
present, absent, or still in doubt?
Present_____________
Absent_____________
In doubt______________
