Aluminium metal is frequently used as a reducing agent for the extraction of metals such as chromium and manganese from their respective oxides, why?

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Solution

Aluminium is more electropositive than Manganese( $Mg$ ) and Chromium( $Cr$ ). The process of reduction is known as Aluminothermy.
The Thermite mixture :
${Fe}_{2} O_{3} (s) + Al (s)$ in 3 :1 ratio used
Reactions :
${CrO}_{3} (s) + 2 Al (s) \to {Al}_{2} O_{3} (s) + Cr (s)$
$3 {Mn}_{3} O_{4} (s) + 8 Al (s) \to 4 {Al}_{2} O_{3} (s) + 9 Mn (s)$

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Aluminium metal is frequently used as a reducing agent for the extraction of metals such as chromium and manganese from their respective oxides, why?

Aluminium is more electropositive than Manganese(Mg) and Chromium(Cr). The process of reduction is known as Aluminothermy. The Thermite mixture :Fe2O3(s)+Al(s) in 3 :1 ratio used Reactions : CrO3(s)+2Al(s)→Al2O3(s)+Cr(s)3Mn3O4(s)+8Al(s)→4Al2O3(s)+9Mn(s)