A) \[W\] from \[W{{O}_{3}}\]
B) \[Mn\] from \[M{{n}_{3}}{{O}_{4}}\]
C) \[Cr\] from \[C{{r}_{2}}{{O}_{3}}\]
D) \[Na\] from \[N{{a}_{2}}O\]
Correct Answer: D
Solution :
Sodium metal cannot be extracted by using \[Al\] as reducting agent because Na is more electropositive than aluminium.
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