Learn

Friday, 9 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 29 June 2022, Shift 1, Chemistry Q68

Question 68 of 90 in this shift, Chemistry question 8 of 30, Section A.

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium ?
  1. (1)HOCl+H2O2→H3O++Cl−+O2\mathrm{HOCl + H_2O_2 \rightarrow H_3O^+ + Cl^- + O_2}
  2. (2)PbS+4H2O2→PbSO4+4H2O\mathrm{PbS + 4H_2O_2 \rightarrow PbSO_4 + 4H_2O}
  3. (3)2MnO4−+3H2O2→2MnO2+3O2+2H2O+2OH−\mathrm{2MnO_4^- + 3H_2O_2 \rightarrow 2MnO_2 + 3O_2 + 2H_2O + 2OH^-}Official answer
  4. (4)Mn2++H2O2→Mn4++2OH−\mathrm{Mn^{2+} + H_2O_2 \rightarrow Mn^{4+} + 2OH^-}

Official answer

Option 3

NTA final key (2022 Session 1).

Chapter
Hydrogen
Topic
Hydrogen and Hydrides
Idea tested
Redox Behavior of Hydrogen Peroxide

Same idea in other shifts

Asked 2× in all
  1. 16 Mar 2021, Shift 2 · Q35The correct statements about H2O2\mathrm{H_2O_2} are : (A) used in the treatment of effluents. (B) used as both oxidising and reducing…MediumOther

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.