Poling process is used

1.	Poling process is used
A.	for the removal of \[C{{u}_{2}}O\] from Cu
B.	for the removal of \[A{{l}_{2}}{{O}_{3}}\] from Al
C.	for the removal of \[F{{e}_{2}}{{O}_{3}}\] from Fe
D.	In all the above
Answer» B. for the removal of \[A{{l}_{2}}{{O}_{3}}\] from Al

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Poling process is used

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