氧化还原反应的化合价升降问题NH4NO3----N2+H20+HNO3P+Naoh---PH3+nah2po4(NH4)2SO4--NH3+SO2+N2+H20SO2+H2S--S+H20FE+H2so4--Fe(SO4)3+SO2+H20CrI3+CL2+KOH--K2CrO4+KIO4+KCI+H20Fe3c+HNO3--Fe(NO3)3+co2+no2+h20求达人帮我把这几个方程式
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