Question

A substance that will oxidise aqueous Iron (II) ions to Iron (III) ions:

• A. Chlorine
• B. Bromine
• C. Platinum
• D. oxygen

Answer 1

The correct option is A Chlorine

When chlorine reacts with iron(II) ions in solution, chloride ions and iron(III) ions are produced.

Ionic equation:

$C{l}_2\left(g\right)+2F{e}^{2+}\left(aq\right)\to 2C{l}^{-}\left(aq\right)+2F{e}^{3+}\left(aq\right)$

The equation shows that the $F{e}^{2+}$ ions have formed $F{e}^{3+}$ ions, i.e., each ion has lost an electron. This means the $F{e}^{2+}$ ions have been oxidised.