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The given reaction shows one of the proc...

The given reaction shows one of the processes to extract the metals like Iron and Manganese.
`MnO_2 (s) + Al(s) rightarrow Mn(l) + Al_2O_3(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.

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