Question 1
The
flotation process used in metallurgy involves
◦ the roasting of sulfides.
◦ separation of gangue from ore.
◦ electrolytic reduction..
◦ chemical reduction of a metal.
◦ zone refining.
Question 2
The Hall process involves the reduction of Al
2O
3 to aluminum by
◦ carbon (coke).
◦ carbon monoxide.
◦ molecular hydrogen.
◦ sodium.
◦ electrolysis.