Science
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
MnO2 (s) + Al(s) ⟶ Mn(l) + Al2O3(s) + Heat
(a) Give reason why the above reaction is known as a thermite reaction.
(b) Identify the substance oxidised and reduced in the above reaction.
(c) Give a reason why Aluminium is preferably used in thermite reactions.
Answer
(a) The reaction is known as thermite reaction because the amount of heat evolved is very large due to which the metal (Mn) produced is in molten state.
(b) Al is oxidised and forms Al2O3
MnO2 is reduced to Mn
(c) Aluminium is highly reactive and is placed above Fe and Mn in the reactivity series. Hence, it reduces MnO2 to Mn and Fe2O3 to Fe and is used in thermite reactions.
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