1. Урівняйте рівняння реакцій
H2504 + Fe2O3-> Fe2(S04)3 + H2O
Na2O+ H2O + NaOH
MgO + H3PO4 → Mg3(PO4)2+ H2O
Pb(NO3)2 - PbO + NO2 + O2​
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