How are impurities separated from bauxite ore to get pure alumina ?

What is leaching? How alumina is separated from bauxite by this process?

Write the reactions involved in the following processes. Leaching of bauxite ore to prepare pure alumina.

State the impurities present in the bauxite ore.

How are magnetic ores separated from non magnetic impurities ? Explain .

Iron ores are separated from its impurities by-

Common impurities present in bauxite ore are ____ .

Common impurities present in bauxite ore are ____ .

Common impurities present in bauxite ore are ____ .