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Which of the following is an example of a comproportionation reaction (a reaction where two different oxidation states of the same element combine to give a product in a single intermediate oxidation state)?
- NH4NO2 -> N2 + 2H2O
- KClO3 -> KCl + KClO4
- PCl5 -> PCl3 + Cl2
- Mg + N2 -> Mg3N2
Correct answer: NH4NO2 -> N2 + 2H2O
Solution
In NH4NO2: N is -3 in NH4+ and +3 in NO2-. Both combine to form N2 (oxidation state 0), which is the average/intermediate oxidation state — a classic comproportionation. Option B (KClO3 disproportionation gives Cl⁻¹ and Cl^+7), option C is decomposition, option D is a combination reaction involving different elements.
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