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  4. Which of the following molecules can act as an oxidizing as well as a reducing agent ?

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Q. Which of the following molecules can act as an oxidizing as well as a reducing agent ?

Redox Reactions

Solution:

$H_2O_2$ can act both as an oxidising as well as a reducing agent.
Oxidising agent
$PbS + 4H_2 O_2 \rightarrow \underset{\text{white ppt. }}{PbSO_4 } + 4H_2O$
Reducing agent
$\underset{\text{ (moist) }}{ Ag_2O} + H_2O_2 \rightarrow 2Ag + H_2 O + O_2 $