Write the chemical equation for the following events.

Zinc oxide is dissolved in dilute hydrochloric acid.

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.

Divide the metals Cu, Zn, Ca, Mg, Fe, Na, Li into three groups, namely reactive metals, moderately reactive metals and less reactive metals.