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In which of the following reactions does an element in the same substance undergo both oxidation and reduction simultaneously?

Answer and explanation

Correct answer: 2H₂O₂ → 2H₂O + O₂

In hydrogen peroxide, oxygen has oxidation number −1. During decomposition, some oxygen atoms become −2 in H₂O, so they are reduced, while other oxygen atoms become 0 in O₂, so they are oxidised. The same compound therefore undergoes simultaneous oxidation and reduction; this is disproportionation. The other choices are displacement, combination, and double-displacement reactions, not disproportionation.

Related tags

ScienceClass10Redox ReactionsDisproportionationOxidation NumberChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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