July 2022 1 8 Report
Без изменения степени окисления протекает реакция
 А CaCO3 → CaO + CO2
Б Fe + 2 HCl → FeCl2 + H2
 В 3Ca + 2H3PO4 → Ca3 (PO4) 2 + 3H2
Г 4P + 5O2 → 2P2O5.
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