Which one of the following metal cannot be extracted by using Al as a

1.	Which one of the following metal cannot be extracted by using Al as a reducing agent ?
Answer» Na from `Na_(2)O` `Cr` from `Cr_(2)O_(3)` `MN` from `Mn_(3)O_(4)` W from `WO_(3)` Solution :Because Na is more ELECTROPOSITIVE than Aluminium.

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