Question

$Fe^{3+}$ is reduced to $Fe^{2+}$ by using -

• A. $H_2O_2$ in presence of $NaOH$
• B. $Na_2O_2$ in water
• C. $H_2O_2$ in presence of $H_2SO_4$
• D. $Na_2O_2$ in presence of $H_2SO_4$

Answer 1

Answer: (A), (B)

$Fe^{+3} + H_{2}O_{2} + NaOH → Fe^{+2} + O_{2}$
$Fe^{+3} +\begin{bmatrix}Na_{2}O_{2}+H_{2}O\\ ↓\\ NaOH + H_{2}O_{2}\end{bmatrix} \to Fe^{+2} + O_{2}$