1) Cr₂O₃ + 3 H₂ ==(t°C)==> 2 Cr + 3 H₂O
2) Al₂O₃ + 3 H₂ ==(t°C)==> 2 Al + 3 H₂O
3) Zn + 2 HCl ===> ZnCl₂ + H₂↑
4) Fe + 2 HCl ===> FeCl₂ + H₂↑ 5) 2 KBr + Cl₂ ===> 2 KCl + Br₂
1) Cr₂O₃ + 3 H₂ ==(t°C)==> 2 Cr + 3 H₂O
2) Al₂O₃ + 3 H₂ ==(t°C)==> 2 Al + 3 H₂O
3) Zn + 2 HCl ===> ZnCl₂ + H₂↑
4) Fe + 2 HCl ===> FeCl₂ + H₂↑
5) 2 KBr + Cl₂ ===> 2 KCl + Br₂