The first step in the purification of a metal M is represented by the following figure.To which process does the figure correspond,and which metal is usually purified by this process? 
A) The Mond process,for the purification of Zn
B) The Mond process,for the purification of Ni
C) The Hall process,for the purification of Al
D) The Hall process,for the purification of Cr
E) The zone refining process,for the purification of Fe
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