1. Степень окисления фосфора уменьшается в ряду: 1) K3PO4, K2HPO3, CA3P2; 2) P4O6, H4P2O7, KPH2O2; 3) H2PHO3, KPO3, PH3; 4) PH3, H3PO4, P2O5.
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