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Aluminium metal is generally used for th...

Aluminium metal is generally used for the extraction of chromium and manganese from their oxide ores. Explain.

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Aluminium has a very strong affinity for oxygen. It reduces the oxides of chromium and manganese to the metallic forms. This can also be explained on the basis of Ellingham diagram.
`Cr_(2)O_(3) +2Al overset("Heat") to Al_(2)O_(3) +2Cr`
`3Mn_(3)O_(4) +8Al overset("Heat") to 4Al_(2)O_(3)+9Mn`

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