Question

Which of the following statement(s) is/are correct with reference to $F{e}^{2+}$ and $F{e}^{3+}$ ions ?

1. $F{e}^{3+}$ gives brown colour with potassium ferricyanide
2. $F{e}^{2+}$ gives blue colour with potassium ferricyanide
3. $F{e}^{3+}$ gives red colour with potassium thiocyanate
4. $F{e}^{2+}$ gives brown colour with ammonium thiocyanate

• A. 1, 2
• B. 1, 4
• C. 1, 2, 3
• D. All of these

Answer 1

The correct option is C 1, 2, 3

1. $F{e}^{3+}$ gives brown colour with potassium ferricyanide.

Eg : $FeC{l}_3+K_3\left[Fe\right(CN{)}_6]⟶F{e}_4[Fe\left(CN{)}_6\right]+KCl$

2. $F{e}^{2+}$ gives blue colour with potassium ferricyanide.

Eg : $FeS{O}_4+K_3\left[Fe\right(CN{)}_6]⟶F{e}_3[Fe\left(CN{)}_6\right]+K_{2}S{O}_4$

3. $F{e}^{3+}$ gives red colour with potassium thiocyanate.

Eg : $FeC{l}_3+3KCNS⟶Fe(CNS{)}_3+KCl$

Hence, option C is correct.