Укажите начальную и конечную степень окисления серы А) SO2+H2S=S+H2O
Б) S+O=SO2
В) S+H2=H2S
Г) H2S+O2=S+H2O
Д) H2S+O2=SO2+H2O
E) SO2+O2=SO3
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