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धातु जैसे Cr, Mn, Fe आदि के निष्कर्षण में Al धातु अपचायक के रूप में प्रयुक्त किया जाता है, क्यों ?

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Al अधिक संख्या में कम धन विद्युती धातु ऑक्साइडों को धातु में अपचयित करता है, क्योंकि इसकी प्रबल प्रवृत्ति ऑक्सीजन के साथ संयोग करके ऑक्साइड बनाने की होती है।
`Cr_2O_3 + 2Al to Al_2O_3+2Cr+ "ऊष्मा"`
`Fe_2+2Alto Al_2O_3+2Fe+"ऊष्मा"`

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