F e 3 + is reduced to F e 2 + by using

Fe3+ is reduced to Fe2+ by using
  1. H2O2 in presence of NaOH
  2. Na2O2 in water
  3. H2O2 in presence of H2SO4
  4. Na2O2 in presence of H2SO4

Solution

In basic medium \(\mathrm{H}_2 \mathrm{O}_2\) acts as reducing agent. \(\mathrm{Na}_2 \mathrm{O}_2+2 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{NaOH}+\mathrm{H}_2 \mathrm{O}_2\) \(2 \mathrm{Fe}^{3+}+\mathrm{H}_2 \mathrm{O}_2+2 \mathrm{OH}-\rightarrow 2 \mathrm{Fe}^{2+}+2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2\)

Asked in: JEE Advanced 2015 (Paper 1)

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