<span>4NH3+3SO2=2N2+3S+6H2O</span><span>
2I 2N(3-)-6e->N2(0) восстановитель окисление
3I S(4+)+4e->S(0) окислитель восстановление</span>
H2+Br2=2HBr
4As+3O2=2As2O3
2Na+Cl2=2NaCl
2CO+O2=2CO2
N2+3H2=2NH3
2Cr+3O2=2Cr2O3
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