1.

In the extraction of aluminium metal, one of the process is summarised as follows :

Answer»

`{:(" "I,II,III," "IV," "V),(NaOH,Al^(3+),HF,Na_(3)AlF_(6),"Cathode"):}`
`{:(" "I,II,III," "IV," "V),(NaOH,NaAlO_(2),CO_(2),NaF,"Anode"):}`
`{:(" "I,II,III," "IV," "V),(H_(2)SO_(4),Al_(2)(SO_(4))_(3),NH_(3),Na_(3)AlF_(6),"Cathode"):}`
`{:(" "I,II,III," "IV," "V),(NaOH,NaAlO_(2),CO_(2),Na_(3)AlF_(6),"Cathode"):}`

Answer :D


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