Question

*In Leaching of alumina from bauxite for precipitation the solution is seeded with __________.*

1. freshly prepared samples of hydrated NaHCO₃
2. freshly prepared samples of hydrated Al₂O₃
3. freshly prepared samples of hydrated NaOH
4. freshly prepared samples of hydrated NaCN​

Answer 1

Answer:

option 2 is correct... answer

Answer 2

Solution:

option 2 is correct.

Explanation:

The solution of sodium aluminate is neutralized by passing CO2 gas and the solution is seeded with freshly prepared hydrated Al2O3 which induces the precipitation. It is filtered, dried and heated to get pure Al2O3. Sodium silicate remains in the solution.