Question 17.
Complete the following statement using every given option.
During the extraction of aluminum…………..
a. Ingredients and gangue in bauxite.
b. Use of leaching during the concentration of ore.
c. The chemical reaction of the transformation of bauxite into alumina by Hall’s process.
d. Heating the aluminum ore with concentrated caustic soda.
Answer:
(a) Silica, Ferric Oxide, and Titanium Oxide are the impurities or gangue in Bauxite
(b) By Hall’s and Bayer’s method, where finally the concentrated alumina can be obtained by the calcination process
(c) Halls Process:
(final calcination method)
(d) Since aluminum oxide is amphoteric in nature, it reacts with NaOH to form water-soluble Sodium aluminate
