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In which of the following reactions does the same substance undergo both oxidation and reduction?

Answer and explanation

Correct answer: \(2H_2O_2 \rightarrow 2H_2O + O_2\)

In option A, oxygen in \(H_2O_2\) has an oxidation number of \(-1\). One part is reduced to \(-2\) in \(H_2O\), while another part is oxidised to \(0\) in \(O_2\). Thus, \(H_2O_2\) undergoes both oxidation and reduction; this is a disproportionation reaction. Option B is also a redox reaction, but zinc is oxidised and copper ions are reduced, so different substances undergo the two changes.

Related tags

Chemical ReactionsRedox ReactionsDisproportionationOxidation NumberClass 10 Science

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