Question

Identify oxidising agent and reducing agent in following reactions
1) 2Mg+O2=2MgO
2) Fe3O4+4H2=3Fe+4H2O
3) H2S+Br2=2HBr+S
4) 2H2+O2=H2O

Answer 1

1 mg is reducing agent and O2 is oxidising agent

Answer 2

1) o2 ( oxidising agent)
2) 4h2(reducing agent)
3) h2s ( reducing agent)
4) o2 (oxidising agent)