Verified Solution • 2025–26 Session
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QJEEM19Ch4d66: JEE Main 2019 Chemistry - Class 12 JEEM19Ch4d66 Solution: The correct statement is :
The correct statement is :
Multiple Choice Options
- A leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate
- B the Hall-Heroult process is used for the production of aluminium and iron
- C pig iron is obtained from cast iron
- D the blistered appearance of copper during the metallurgical process is due to the evolution of CO2
Step-by-Step Verified Solution
(A) Leaching of bauxite :
Al2O3.H2O + NaOH Na[Al(OH)4] + Na2SiO3
So, option (A) is correct.
(B) Hall Heroult’s process is used for aluminium only not for iron.
So, option (B) is wrong.
(C) From Blast Furnace, at the end we get pig iron and in pig iron percentage of carbon is high and after reducing the carbon percantage we get cast iron. So we can say cast iron is obtained from pig iron.
So, option (C) is wrong.
(D) In Bessemer converter following reaction happens :
Cu2S + Air Cu2O + SO2
Cu2O + Cu2S Cu + SO2
So we can say, Appearance of Blister copper is due to evolution of SO2 gas.
Option (D) is wrong.
Al2O3.H2O + NaOH Na[Al(OH)4] + Na2SiO3
So, option (A) is correct.
(B) Hall Heroult’s process is used for aluminium only not for iron.
So, option (B) is wrong.
(C) From Blast Furnace, at the end we get pig iron and in pig iron percentage of carbon is high and after reducing the carbon percantage we get cast iron. So we can say cast iron is obtained from pig iron.
So, option (C) is wrong.
(D) In Bessemer converter following reaction happens :
Cu2S + Air Cu2O + SO2
Cu2O + Cu2S Cu + SO2
So we can say, Appearance of Blister copper is due to evolution of SO2 gas.
Option (D) is wrong.