Question

Fe³⁺ is reduced to Fe²⁺ by using ______.

Options

• H₂O₂ in presence of NaOH

• Na₂O₂ in water

• H₂O₂ in presence of H₂SO₄

• Na₂O₂ in presence of H₂SO₄

Answer 1

Fe³⁺ is reduced to Fe²⁺ by using H₂O₂ in presence of NaOH and Na₂O₂ in water.

Explanation:

Hydrogen peroxide (H₂O₂) acts as a reducing agent in a basic (alkaline) medium. When Na₂O₂ is added to water, it forms sodium hydroxide (NaOH) and hydrogen peroxide (H₂O₂), creating a basic solution. In the basic medium, Fe³⁺ ions gain electrons from the hydrogen peroxide, reducing them to Fe²⁺ ions. The chemical reaction is as follows:

\[\ce{2Fe^{3+} + H2O2 + 2OH- -> 2Fe^{2+} + O2 + 2H2O}\]