Question

give reason
state the reason for te addition of caustic alkali to bauxite ore during purification of bauxite​

Answer 1

Caustic alkali dissolves aluminium oxide forming soluble sodium aluminate while impurities remain insoluble and precipitate as red mud...

Answer 2

$\huge \underline {\mathfrak{hola \: dear}}$

Caustic alkali is added to bauxite, to dissolve bauxite ore and obtain a solution of sodium aluminate.

Reaction ➡Al2O3.­2H2O +2NaOH +heat ---> 2NaAlO2 +3H2O