A) Halls process
B) Baeyer process
C) Ostwald process
D) Hoopes process
Correct Answer: D
Solution :
(i) Ostwald process : It is used to manufacture \[HN{{O}_{3}}\] (ii) Hoopes process: It is method to purify aluminium. Pure Al makes anode and impure aluminium makes cathode in this reaction. (iii) Halls process It is used to purify bauxite having no specific impurity. (iv) Baeyers process: It is used to purify bauxite having chief impurity of iron. \[\therefore \] Hoopes process is correct answer.
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