A) Bauxite ore is heated with \[NaOH\] solution at \[{{50}^{o}}C\]
B) Bauxite ore is fused with \[N{{a}_{2}}C{{O}_{3}}\]
C) Bauxite ore is fused with coke and heated at \[{{1800}^{o}}C\] in a current of nitrogen
D) Bauxite ore is heated with \[NaHC{{O}_{3}}\]
Correct Answer: B
Solution :
In Hall?s process \[A{{l}_{2}}{{O}_{3}}.2{{H}_{2}}O+N{{a}_{2}}C{{O}_{3}}\to 2NaAl{{O}_{2}}+C{{O}_{2}}+2{{H}_{2}}O\]\[2NaAl{{O}_{2}}+3{{H}_{2}}O+C{{O}_{2}}\xrightarrow{333\,K}\]\[2Al{{(OH)}_{3}}\downarrow +N{{a}_{2}}C{{O}_{3}}\] \[2Al{{(OH)}_{3}}\xrightarrow{1473\,K}A{{l}_{2}}{{O}_{3}}+3{{H}_{2}}O\]
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