Extraction of Aluminium

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

Select the best method for the manufacturing of aluminium from bauxite from the following.

The role of graphite in the electrometallurgy of aluminium is:

Which of the following chemical mixture is added to ${\mathrm{Al}}_2{\mathrm{O}}_3$ in Hall-Heroult process?

Common impurities present in bauxite are ..

(a) $\mathrm{CuO}$

(b) $\mathrm{ZnO}$

(c) ${\mathrm{Fe}}_2{\mathrm{O}}_3$

(d) ${\mathrm{SiO}}_2$

Which one of the following statements is incorrect?

To prevent the corrosion of the anode in the Hall-Heroult process which of the following action is done.

Which of the following reactions is not involved in the benificiation of white bauxite?

Which one of the following statements is incomect?

In electrolysis of ${\mathrm{Al}}_2{\mathrm{O}}_3$, by thr Hall-Heroult process:

Which one of the following statements is incorrect?

The carbon-based reduction method is not used for the extraction of :

The purpose of adding ${\mathrm{Na}}_3{\mathrm{AlF}}_6$ to ${\mathrm{Al}}_2{\mathrm{O}}_3$. dúring electrolysis is

Which one of the following statements is incorrect?

Identify the reaction that takesplace in Hall-Heroult's process.

When bauxite is heated with carbon in the atmosphere of nitrogen, products formed are:
 

Which of the following statements is incorrect?
 

Aluminium metal is purified by: