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Q. Aluminothermic process is used for the extraction of metals, whose oxides are

General Principles and Processes of Isolation of Elements

Solution:

Aluminothermic process involves reduction of oxides such as $Fe_{2}O_{3}, Mn_{3}O_{4}, Cr_{2}O_{3}$ etc. to metals with aluminum.
$Cr_{2}O_{3} + 2Al_{2}O_{3} + 2Cr \Delta H = - ve$