Question

Which of the following statement confirms the presence of ferrous ions in the solution while testing for 3rd group ions using ammonium hydroxide solution ?

• A. The formation of a reddish-brown precipitate indicates ferrous ions.
• B. The formation of a greenish precipitate indicates ferrous ions.
• C. The formation of a white precipitate indicates ferrous ions.
• D. None of the above

Answer 1

The correct option is B The formation of a greenish precipitate indicates ferrous ions.

The formation of a reddish brown precipitate indicates $F{e}^{+3}$ whereas a green precipitate indicates both $C{r}^{+3}$ or $F{e}^{+2}.$