A) \[Na[Al{{(OH)}_{4}}]andA{{l}_{2}}{{(C{{O}_{3}})}_{3}}\cdot x{{H}_{2}}O\]
B) \[Al{{(OH)}_{3}}andA{{l}_{2}}{{O}_{3}}\cdot x{{H}_{2}}O\]
C) \[NaAl{{O}_{2}}and\,\,A{{l}_{2}}{{(C{{O}_{3}})}_{3}}\cdot x{{H}_{2}}O\]
D) \[Na[Al{{(OH)}_{4}}]and\,\,A{{l}_{2}}{{O}_{3}}\cdot x{{H}_{2}}O\]
Correct Answer: D
Solution :
In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When \[C{{O}_{2}}\] gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated. 'X' and 'Y' are \[Na[Al{{(OH)}_{4}}]\] and \[A{{l}_{2}}{{O}_{3}}\cdot x{{H}_{2}}O\] respectively. \[\underset{\text{Alumina}}{\mathop{A{{l}_{2}}{{O}_{3(s)}}}}\,+2NaO{{H}_{(aq)}}+3{{H}_{2}}{{O}_{(l)}}\xrightarrow[35-36]{473-523K}\underset{\text{Sodium aluminate}}{\mathop{2Na{{[Al{{(OH)}_{4}}]}_{(aq)}}}}\,\] \[2Na{{\left[ Al{{(OH)}_{4}} \right]}_{(aq)}}+C{{O}_{2(g)}}\xrightarrow[{}]{{}}\underset{\text{Hydrated alumina}}{\mathop{A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}{{O}_{(s)}}}}\,+2NaHC{{O}_{3}}(aq)\]
You need to login to perform this action.
You will be redirected in
3 sec
