JEE Main 2014 · 12 Apr · Shift 1 · Chemistry Q49

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ChemistrySingle correct+4 / -1Question 49 of 90

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 $\ce{H2O2}$ acts as a reducing agent in acid medium ?

\ce{MnO4-}

\ce{Cr2O7^2-}

\ce{SO3^2-}

Answer and worked solution

Official answer: A

$\ce{H2O2}$ reduces acidified permanganate and is itself oxidised to $\ce{O2}$ :
$\ce{2MnO4- + 5H2O2 + 6H+ -> 2Mn^2+ + 5O2 + 8H2O}.$

Topics:Water and hydrogen peroxide Oxidation number

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JEE Main 2014 · 12 Apr · Shift 1, Chemistry question 49