JEE Main 2017 · 8 Apr · Shift 1 · Chemistry Q45

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ChemistrySingle correct+4 / -1Question 45 of 90

In which of the following reactions, hydrogen peroxide acts as an oxidizing agent ?

\ce{HOCl + H2O2 -> H3O+ + Cl- + O2}

\ce{I2 + H2O2 + 2OH- -> 2I- + 2H2O + O2}

\ce{2MnO4- + 3H2O2 -> 2MnO2 + 3O2 + 2H2O + 2OH-}

\ce{PbS + 4H2O2 -> PbSO4 + 4H2O}

Answer and worked solution

Official answer: D

In $\ce{PbS + 4H2O2 -> PbSO4 + 4H2O}$ sulphur goes from −2 to +6 while oxygen in $\ce{H2O2}$ is reduced to −2: $\ce{H2O2}$ is the oxidant. In the other three it is oxidised to $\ce{O2}$ .

Topics:Water and hydrogen peroxide Oxidation number

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JEE Main 2017 · 8 Apr · Shift 1, Chemistry question 45