Question

identify the substances that are oxidised and the substances that are reduced in the following reactions: MnO2 + 4Al ----> 2Mn + 2Al2O3

Answer 1

MnO2 is reduced, Al is oxidised, Al is reducing agent and MnO2 is oxidising agent.

Answer 2

Al gets oxidised
and MnO2 reduced
as their is the transfer of
O2 from MnO2 so its the oxidising agent and
and Al get the oxygen so it is reducing agent.