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  4. In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When CO 2 gas is passed through the aqueous solution of 'X', a hydrated compound ' Y ' is precipitated. ' X ' and ' Y ' respectively are :

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Q. In the leaching method, bauxite ore is digested with a concentrated solution of $NaOH$ that produces '$X$'. When $CO _{2}$ gas is passed through the aqueous solution of '$X$', a hydrated compound ' $Y$ ' is precipitated. ' $X$ ' and ' $Y$ ' respectively are :

JEE MainJEE Main 2018General Principles and Processes of Isolation of Elements

Solution:

In the leaching method, bauxite ore is digested with a concentrated solution of $NaOH$ that produces $X$.
When $CO _{2}$ gas is passed through the aqueous solution of $X$, a hydrated compound $Y$ is precipitated.
$X$ and $Y$ are $Na \left[ Al ( OH )_{4}\right]$ and $Al _{2} O _{3} \cdot xH _{2} O$ respectively.