1.

Name the process by which impure ore of aluminium gets purified by using concentrated solution of an alkali.

Answer»

The process by which impure ore of aluminium gets purified by using concentrated solution of an alkali is known as 'Leaching'. Aluminium is leached out of its ore using sodium hydroxide as sodium aluminate, leaving the impurities behind.

Al2O3(s) + 2NaOH(aq) + 3H2O(l) ---> 2Na[Al(OH)4] (aq)



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