JEE Main 2021 — Hydrogen Question with Solution
From: JEE Main 2021 (Online) 18th March Evening Shift
Question
In basic medium, H2O2 exhibits which of the following reactions?
(A) Mn2+ Mn4+
(B) I2 I
(C) PbS PbSO4
Choose the most appropriate answer from the options given below :
(A) Mn2+ Mn4+
(B) I2 I
(C) PbS PbSO4
Choose the most appropriate answer from the options given below :
Choose an option
Show full solutionCorrect option: B
Correct answer
B(A), (B) only
Step-by-step explanation
In basic medium, oxidising action of H2O2.
Mn2+ + H2O2 Mn+4 + 2OH–
In basic medium, reducing action of H2O2.
I2 + H2O2 + 2OH– 2I– + 2H2O + O2
In acidic medium, oxidising action of H2O2.
PbS(s) + 4H2O2(aq) PbSO4(s) + 4H2O(l)
Mn2+ + H2O2 Mn+4 + 2OH–
In basic medium, reducing action of H2O2.
I2 + H2O2 + 2OH– 2I– + 2H2O + O2
In acidic medium, oxidising action of H2O2.
PbS(s) + 4H2O2(aq) PbSO4(s) + 4H2O(l)
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This is a previous-year question from JEE Main 2021, covering the Hydrogen chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.