JEE Main | 2014Redox and Equivalent ConceptHard
Question
In which of the following reactions H2O2 acts as a reducing agent?
(a) H2O2 + 2H+ + 2e- → 2H2O
(b) H2O2 - 2e- → O2 + 2H+
(c) H2O2 + 2e- → 2OH-
(d) H2O2 + 2OH- - 2e- → O2 + 2H2O
(a) H2O2 + 2H+ + 2e- → 2H2O
(b) H2O2 - 2e- → O2 + 2H+
(c) H2O2 + 2e- → 2OH-
(d) H2O2 + 2OH- - 2e- → O2 + 2H2O
Options
A.(a), (b)
B.(c), (d)
C.(a), (c)
D.(b), (d)
Solution
The reducing agent oxidises itself.
(a) H2O2-1 + 2H+ + 2e- → 2H2O-2
(b) H2O2-1 - 2e → O20 + 2H+
(c) H2O2-1 + 2e → 2OH-
(d) H2O2-1 + 2e → O20 + H2O
Note : Powers of ′O′ are oxidation number of ′O′ in the compound.
(a) H2O2-1 + 2H+ + 2e- → 2H2O-2
(b) H2O2-1 - 2e → O20 + 2H+
(c) H2O2-1 + 2e → 2OH-
(d) H2O2-1 + 2e → O20 + H2O
Note : Powers of ′O′ are oxidation number of ′O′ in the compound.
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