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 :
- $NaAlO_2 $ and $Al_2(CO3)_3?x H_2O$
- $Al(OH)_3 $ and $Al2O_3?x H_2O$
- $Na[Al(OH)_4] $ and $Al_2O_3?x H_2O$
- $ Na[Al(OH)4]$ and $Al_2(CO3)_3?x H_2O$
The Correct Option is C
Solution and Explanation
$\left(X\right)$
$?CO_2$
$Al_2O_3\cdot xH_2O$
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Concepts Used:
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What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal