General Science Chemistry Chemical Reaction

కింది వాటిలో ఏది ఆక్సీకరణ-తగ్గింపు ప్రతిచర్య?

1
NaOH + HCl → NaCl + H2O
2
CaO + H2O → Ca(OH)2
3
2Mg + O2 → 2MgO
4
Na2SO4 + BaCl2 → BaSO4 + 2NaCl

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