Hydrogen And Its Compounds Question 31
Question: 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-
Options:
A) $ MnO_4^{-} $
B) $ Cr_2O_7^{2-} $
C) $ SO_3^{2-} $
KI
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Answer:
Correct Answer: A
Solution:
$ 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\xrightarrow{{}} $
$ K_2SO_4+2MnSO_4+8H_2O_2+5H_2O $
BETA
