Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

The correct statement is 

  1. A

    Pig iron is obtained from cast iron. 

  2. B

    Leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate. 

  3. C

    The blistered appearance of copper during the metallurgical process is due to the evolution of CO2 .

  4. D

    The Hall-Heroult process is used for the production of aluminium and iron.

Solution

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)

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