Цепочка превращения P → P2O5 → H3PO4 → H2O → NaOH → Na3PO4 7. Si → SiO2 → Na2SiO3 → H2SiO3 → SiO2 → Li2SiO3 8. Ca → CaO → CaCO3 → CaCl2 → Ca(OH)2 → CaCO3 9. N2O5 → HNO3 → Ca(NO3)2 → CaCO3 → Ca(NO3)2 → Ca(OH)2 10. Mg(OH)2 → MgO → MgCO3 → MgCl2 → Mg(NO3)2 →Mg3(PO4)2
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