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  4. In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :

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Q. In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with $NaOH$ is :

JEE MainJEE Main 2021General Principles and Processes of Isolation of Elements

Solution:

In bauxite impurities of $Fe _{2} O _{3}, TiO _{2}$ and $SiO _{2}$ are present, $Fe _{2} O _{3}$ and $TiO _{2}$ are basic oxides therefore does not reacts with or dissolve in $NaOH$ whereas $SiO _{2}$ is acidic oxide it gets dissolve in $NaOH$, hence leach out $SiO _{2}+2 NaOH \rightarrow Na _{2} SiO _{3}$ (aq.) $+ H _{2} O$