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During decomposition of \( \boldsymbol{H}_{2} \boldsymbol{O}_{2}, \) it undergoes:

1. oxidation
2. reduction
3. redox reaction
4. disproportionation

Correct answer: disproportionation

Solution

In hydrogen peroxide, oxygen has oxidation state -1. During decomposition, some oxygen atoms are oxidized to 0 in O2 while others are reduced to -2 in H2O, so the same element is simultaneously oxidized and reduced. That makes the reaction a disproportionation.

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