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Cl₂(0) ---> 2Cl(VII) + 14e /*2
7O₂(0) + 28e ---> 14O(-II) /*1
Cl₂ --- reduktor
O₂ --- utleniacz
2) 3Cu + 8HNO₃ ---> 3Cu(NO₃)₂ + 2NO + 4H₂O
Cu(0) ---> Cu(II) + 2e /*3
N(V) + 3e ---> N(II) /*2
Cu --- reduktor
HNO₃ --- utleniacz
3) 2FeCl₂ + H₂O₂ + 2HCl ---> 2FeCl₃ + 2H₂O
Fe(II) --->Fe(III) + 1e /*2
2O(-I) +2e ---> 2O(-II) /*1
FeCl₂ --- reduktor
H₂O₂ --- utleniacz