Решите степень окисления
Fe2O3, H2, H2CO2, NH4OH, Ca3(AsO4)2
SO3, N2, CuS, Al2(SlO3)3, HPO3
Fe2O3, H2, H2CO2, NH4OH, Ca3(AsO4)2
SO3, N2, CuS, Al2(SlO3)3, HPO3
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Fe2(+3)O3(-2), H2(0), H2(+1)C(+4)O3(-2), N(-3)H4(+1)O(-2)H(+1), Ca3(+2)(As(+5)O4(-2))2, S(+6)O3(-2), N2(0), Cu(+2)S(-2), Al2(+3)(Si(+4)O3(-2))3, H(+1)P(+5)O3(-2).