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P2(V)O5(II), Si(IV)O2(II), Ca(II)O(II), AL2(III)O3(II), Na2(I)O(II), PCl5, SiCl4, CaCl2, AlCl3, NaCl 3H2+N2=2NH3 2Al+3Cl2=2AlCl3 2HBr=H2+Br2 2Au2O3=4Au+3O2