1)Na(+1)cl(-1)=Na(0)+Cl2(0)
Na(+1) +1e = Na(0) | 1 | 2
2Cl(-1) -1e = 2Cl(0) | 2 | 1
2NaCl=2Na+Cl2
2)2Na(+1)cl(-1) +2H2(+1)O(-2)=Cl2(0)+H2(0)+2Na(+1)O(-2)H(+1)
2Cl(-1) -1e = 2Cl(0) | 2 | 1
2H(+1) +1e = 2H(0) | 2 | 1
3)Fe(+2)O(-2)+H2(0)=H2(+1)O(-2)+Fe(0)
Fe(+2) +2e = Fe(0) | 2 | 1
2H(0) -1e = 2H(+1) | 2 | 1
4)Zn(+2)O(-2)+C(0)=C(+2)O(-2)+Zn(0)
Zn(+2) +2e = Zn(0) | 2 | 1
C(0) -2e = C(+2) | 2 | 1
5)Cr2(+3)O3(-2)+2N(-3)H3(+1)=2Cr(0)+3H2(+1)O(-2)+N2(0)
2Cr(+3) +3e = 2Cr(0) | 6 | 1
2N(-3) -3e = 2N(0) | 6 | 1
6)Cr2(+3)O3(-2)+2Al(0)=Al2(+3)O3(-2)+2Cr(0)
2Cr(+3) +3e = 2Cr(0) | 6 | 1
2Al(0) -3e = 2Al(+3) | 6 | 1