A) leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate
B) the blistered appearance of copper during the metallurgical process is due to the evolution of \[C{{O}_{2}}\]
C) pig iron is obtained from cast iron
D) the Hall-Heroult process is used for the production of aluminium and iron
Correct Answer: A
Solution :
[a] During leaching when bauxite is treated with concentrated NaOH, then sodium aluminate and sodium silicate is formed in the soluble form, whereas \[F{{e}_{2}}{{O}_{3}}\]is precipitated [b] The blistered appearance of copper during the metallurgical process is due to the evolution of \[S{{O}_{2}}.\] [c] Cast iron is obtained from pig iron. [d] Hall-Heroult process is used for production of only aluminium.
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