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ICSE Class 10 Chemistry 2020 Paper

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Question : 50 of 86
Marks: +1, -0
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⋅2H2OBauxite+2NaOH→2NaAlO2\underset{\text{Bauxite}}{\mathrm{Al}_2\mathrm{O}_3\cdot 2\mathrm{H}_2\mathrm{O}} + 2\mathrm{NaOH} \rightarrow 2\mathrm{NaAlO}_2 +3H2O+3\mathrm{H}_2\mathrm{O}
NaAlO2+2H2O→Al(OH)3+NaOH\mathrm{NaAlO}_2+2\mathrm{H}_2\mathrm{O} \rightarrow \mathrm{Al}(\mathrm{OH})_3+\mathrm{NaOH}
2Al(OH)3→1000∘CAl2O3Alumina+3H2O2\mathrm{Al}(\mathrm{OH})_3 \\ \xrightarrow{1000^{\circ}\mathrm{C}}{\underset{\text{Alumina}}{\mathrm{Al}_2\mathrm{O}_3}} + 3\mathrm{H}_2\mathrm{O}
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