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Which of the following metal can not be ...

Which of the following metal can not be extracted by smelting process

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Aluminium cannot be extracted by smelting process due to the following reason.
(a) Aluminium (Al) being highly electropositive element has very strong affinity for oxygen. So, `Al_(2)O_(3)` is very stable compound and cannot be reduced by C.
(b) ON heating `Al_(2)O_(3)` with C, aluminium carbide is formed
`2Al_(2)O_(3) + 9C rarr Al_(4)C_(3) + 6CO`.
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