Hydrogen peroxide acts both as an oxidising and as a reducing age… - Vidyadip

MCQ

Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species . In which of the following cases $H_2O_2$ acts as a reducing agent in acid medium?

✓
$MnO_4^-$
B
$Cr_2O_7^{2-}$
C
$SO_3^{2-}$
D
$KI$

✓

Answer

Correct option: A.

$MnO_4^-$

a
$H_2O_2$ acts as a reducing agent only in presence of strong oxidising agents ($i.e.,MnO_4^-$ ) in acidic as well as alkaline medium. $2KMnO_4 + 3H_2SO_4 + 5H_2O_2 \to K_2SO_4 + 2MnSO_4 + 8H_2O + 5O_2$

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