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The complex formed when Al2O3 is leached form Bauxite using concentrated NaOH solution is,

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The complex formed when Al2O3 is leached form Bauxite using concentrated NaOH solution is, 

(1) NaAl2O4 

(2) Na2AlO2 

(3) Na[Al(OH)4] 

(4) Na2[Al(OH)3]

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Best answer

Correct option (3) Na[Al(OH)4]

Explanation:

Al2O3 + 2NaOH +3H2O→ 2Na[Al(OH)4]

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