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  • The following reaction takes place when aluminium powder is heated with MnO2 3 MnO2 (s) + 4 Al (s) → 3 Mn (l) + 2 Al2O3 (l) + Heat (a) Is aluminium getting reduced? (b) Is MnO2 getting oxidised

The following reaction takes place when aluminium powder is heated with MnO2

3MnO_{2}\left ( s \right )+4Al\left ( s \right )\rightarrow 3Mn\left ( l \right )+2Al_{2}O_{3}\left ( l \right )+Heat
(a) Is aluminium getting reduced?
(b) Is MnO2 getting oxidised?

Answers (1)

Ans.
Oxidation is the loss of electrons and reduction is the gain of electrons.
In the reaction:
3MnO_{2}\left ( s \right )+4Al\left ( s \right )\rightarrow 3Mn\left ( l \right )+2Al_{2}O_{3}\left ( l \right )+Heat
(a) Aluminium is getting oxidised because there is an addition of oxygen
(b) MnO2 is getting reduced because there is removal of oxygen.

 

 

 

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