*38. Complete the following statement using every given options,During the extraction of aluminiumi.Ingredients of gangue and bauxite.Use of leaching during the concentration ofore.jii.Chemical reaction of transformation ofbauxite into alumina by Hall's process.iv. Heatingthe aluminium orewithconcentrated caustic soda.ii.

*38. Complete the following statement using every given options,Duri

1.	*38. Complete the following statement using every given options,During the extraction of aluminiumi.Ingredients of gangue and bauxite.Use of leaching during the concentration ofore.jii.Chemical reaction of transformation ofbauxite into alumina by Hall's process.iv. Heatingthe aluminium orewithconcentrated caustic soda.ii.
Answer» 4. HEATING the aluminum or with concentrated CAUSTIC SODA