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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.
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Answer:
A thermite reaction is an exothermic reaction which involves reaction of a metal oxide ((MnO 2 ) with a metal (Al). This reaction produces Aluminum oxide (Al 2 O 3 ) and free Manganese
(b) Identify the substance oxidised and reduced in the above reaction.
Answer:
Since Aluminum is gaining oxygen, it is getting oxidized.
MnO 2 is losing oxygen, so it is getting reduced.
(c) Give a reason why Aluminium is preferably used in thermite reactions.
Answer:
Aluminum is more reactive as compared to Fe or Mn so it has the ability to react with their oxides. Also, due to high reactivity of aluminum, there is a rapid and intense release of heat during the reaction.
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