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BITSAT 2010
Exam
BITSAT
Year
2010
Subject
Chemistry
Chapter
Redox Reactions

BITSAT 2010 · Chemistry · Redox Reactions

In which of the following reactions, H_ 2 O_ 2 is acting as a...

In which of the following reactions, H2O2\mathrm{H}_{2} \mathrm{O}_{2} is acting as a reducing agent?

Options

  1. AH2O2+SO2→H2SO4\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{SO}_{2} \rightarrow \mathrm{H}_{2} \mathrm{SO}_{4}
  2. B2KI+H2O2→2KOH+2 \mathrm{KI}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{KOH}+\mathrm{I}2_{2}
  3. CPbS+4H2O2→PbSO4+4H2O\quad \mathrm{PbS}+4 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{PbSO}_{4}+4 \mathrm{H}_{2} \mathrm{O}
  4. DAg2O+H2O2→2Ag+H2O+O2\mathrm{Ag}_{2} \mathrm{O}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{Ag}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}

Correct answer

D. Ag2O+H2O2→2Ag+H2O+O2\mathrm{Ag}_{2} \mathrm{O}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{Ag}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}

Step-by-step solution

SO2\mathrm{SO}_{2} changes to H2SO4\mathrm{H}_{2} \mathrm{SO}_{4} (O.N. changes from +4 to +6 oxidation )) 2KI→2 \mathrm{KI} \rightarrow\mathrm{I}2(O.S._{2}(\mathrm{O} . \mathrm{S} . changes from -1 to 0 oxidation) PbS→PbSO4(O.S\mathrm{PbS} \rightarrow \mathrm{PbSO}_{4}(\mathrm{O} . \mathrm{S}. changes from -2 to +6 oxidation) Ag2O→2Ag(O.S.\mathrm{Ag}_{2} \mathrm{O} \rightarrow 2 \mathrm{Ag}(\mathrm{O} . \mathrm{S} . changes from +1 to 0 reduction)
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