In Hall's process, bauxite rich in iron oxide is fused with Na2CO3 to give soluble NaAlO2. Aluminium hydroxide is then precipitated from the aqueous extract by passing

JEE Main levelSingle correct optionDifficulty 2 of 3mt124

In Hall's process, bauxite rich in iron oxide is fused with $Na X_{2} CO X_{3}$ to give soluble $NaAlO X_{2}$ . Aluminium hydroxide is then precipitated from the aqueous extract by passing

Al X_{2} O X_{3} + Na X_{2} CO X_{3} 2 NaAlO X_{2} + CO X_{2}

is followed by

2 NaAlO X_{2} + CO X_{2} + 3 H X_{2} O 2 Al (OH) X_{3} + Na X_{2} CO X_{3}

. Carbon dioxide acidifies the aluminate solution and precipitates

Al (OH) X_{3}

, regenerating sodium carbonate.