Răspuns:
1.
Al + 3 O2 → 2 Al2O3
4 Al0 - 12 e- → 4 AlIII (oxidare) agent reducator
6 O0 + 12 e- → 6 O-II (reducere) agent oxidant
2 H2S + 3 O2 → 2 SO2 + 2 H2O
2 S-II - 12 e- → 2 SIV (oxidare) agent reducator
6 O0 + 12 e- → 6 O-II (reducere) agent oxidant
P4 + 5 O2 → P4O10
4 P0 - 20 e- → 4 PV (oxidare) agent reducator
10 O0 + 20 e- → 10 O-II (reducere) agent oxidnat
2.
NiO + H2 → Ni + H2O
2 H0 - 2 e- → 2 HI (oxidare) agent reducator
NiII + 2 e- → Ni0 (reducere) agent oxidant
CuO + C → CO + Cu
CuII + 2 e- → Cu0 (reducere) agent oxidant
C0 - 2 e- → CII (oxidation) agent reducator
3 V2O5 + 10 Al → 6 V + 5 Al2O3
6 VV + 30 e- → 6 V0 (reducere) agent oxidant
10 Al0 - 30 e- → 10 AlIII (oxidare) agent reducator
Explicație:
