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ICSE Class 10 Chemistry 2020 Solved Paper

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Question : 50
Total: 86
Baeyer's process is used to concentrate bauxite ore to alumina.
Give balanced chemical equations for the reaction taking place for its conversion from bauxite to alumina.
Solution:  
Al2O3⋅2H2O
Bauxite
+2‌NaOH→2NaAlO2 +3H2O
NaAlO2+2H2O→Al(OH)3+NaOH
2‌Al(OH)3‌ ‌
1000∘C
─────▸
‌
Al2O3
Alumina
+3H2O
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