Question

In which of the following reaction does $H_{2}O_{2}$ acts as a reducing agent ?

• A. $2FeCl_{2}+2HCl+H_{2}O_{2} \rightarrow 2FeCl_{3}+2H_{2}O$
• B. $Cl_{2}+H_{2}O_{2} \rightarrow 2HCl+O_{2}$
• C. $2HI+H_{2}O_{2} \rightarrow 2H_{2}O+I_{2}$
• D. $H_{2}SO_{3}+H_{2}O_{2} \rightarrow H_{2}SO_{4}+H_{2}O$

Answer 1

Answer: (B)

Reducing nature of $H_{2}O_{2}$ means it reduces other substance and itself gets oxidised by evolving $O_{2}$ .
In (a), $Fe^{2 +}$ gets oxidised to $Fe^{+ 3}$ .
In (b), $Cl_{2}$ gets reduced to $Cl^{-}$ .
In (c), $I^{-}$ gets oxidised to $I_{2}$
In (d), $S^{+ 4}$ gets oxidised to $S^{+ 6}$