In which of the following reaction is there a change in the oxidation number of any atoms: (1) 2NO2 → N₂O4 (2) NH3+ H2O→ NH4+ + OH- (3) N₂O5 + H₂O → 2HNO3 (4) 2H₂O₂ → H₂O + O₂ nisubithane
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2nd correct
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