Exams › JEE Advanced › Chemistry
Among the following reactions, identify the one that does NOT involve any change in oxidation states (i.e., is not a redox reaction).
- BaO2 + H2SO4 -> BaSO4 + H2O2
- 2BaO + O2 -> 2BaO2
- 2KClO3 -> 2KCl + 3O2
- SO2 + 2H2S -> 2H2O + 3S
Correct answer: BaO2 + H2SO4 -> BaSO4 + H2O2
Solution
In BaO2 + H2SO4 -> BaSO4 + H2O2, Ba stays +2, S stays +6, and O stays -1 (in BaO2 and H2O2) or -2 (in H2SO4 and BaSO4 — though one can verify per atom that no net change occurs at the ionic level); no element changes oxidation state, so this is a double-displacement (metathesis) reaction, not a redox reaction.
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