The correct statement is
a) Pig iron is obtained from cast iron.
b) Leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate.
c) The blistered appearance of copper during the metallurgical process is due to the evolution of CO2.
d) The Hall-Heroult process is used for the production of aluminium and iron.
Question ID - 56466 | SaraNextGen Top Answer The correct statement is
a) Pig iron is obtained from cast iron.
b) Leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate.
c) The blistered appearance of copper during the metallurgical process is due to the evolution of CO2.
d) The Hall-Heroult process is used for the production of aluminium and iron.
The correct statement is
a) Pig iron is obtained from cast iron.
b) Leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate.
c) The blistered appearance of copper during the metallurgical process is due to the evolution of CO2.
d) The Hall-Heroult process is used for the production of aluminium and iron.
During metallurgy of aluminium, when bauxite (powdered ore) is treated with NaOH (conc.), sodium aluminate (Na[Al(OH)4]) is formed and impurity SiO2 dissolves by forming sodium silicate (Na2SiO3)
Al2O3(s) + 2NaOH(aq) + 3H2O(l)
2Na[Al(OH)4](aq)