A) bauxite ore is fused with \[NaOH\]
B) ammonia is prepared
C) \[A{{l}_{2}}{{O}_{3}}\cdot 2{{H}_{2}}O\] is fused with \[NaHC{{O}_{3}}\]
D) bauxite ore is fused with \[N{{a}_{2}}C{{O}_{3}}\]
Correct Answer: D
Solution :
In Halls process, bauxite ore is fused with \[N{{a}_{2}}C{{O}_{3}}\]to form sodium metaaluminate, \[NaAl{{O}_{2}}\] which reacts with water, to precipitate \[Al{{(OH)}_{3}}\]followed by filtration and heating to get pure alumina \[(A{{l}_{2}}{{O}_{3}})\] \[A{{l}_{2}}{{O}_{3}}\cdot 2{{H}_{2}}O+N{{a}_{2}}C{{O}_{3}}\xrightarrow{{}}2NaAl{{O}_{2}}+C{{O}_{2}}+2{{H}_{2}}O\]\[2NaAl{{O}_{3}}+3{{H}_{2}}O+C{{O}_{2}}\xrightarrow{333\,K}\] \[2Al{{(OH)}_{3}}\downarrow N{{a}_{2}}C{{O}_{3}}\] \[2Al{{(OH)}_{3}}\xrightarrow{1473\,K}A{{l}_{2}}{{O}_{3}}+3{{H}_{2}}O\]
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