A. Hall process
B. Thermite process
C. Haber process
D. Contact process
- The correct answer is option (A) Hall process.
- The Hall process is a method for the extraction of aluminum from its ore, bauxite. It was developed by American chemist Charles Martin Hall in 1886 and is still widely used today.
In the Hall process, bauxite is first purified to remove impurities and then dissolved in molten cryolite (Na3AlF6) at high temperature. A direct current is then passed through the molten solution, which causes aluminum ions to be reduced at the cathode and deposited as pure aluminum metal.
The Hall process is an important industrial process for the production of aluminum, which is widely used in a variety of applications, including construction, transportation, and packaging.
- Option (B) Thermite process is a type of exothermic reaction used to produce metals from their oxides, as discussed earlier.
- Option (C) Haber process is a method for the production of ammonia from nitrogen and hydrogen, which is important for the production of fertilizers and other industrial applications.
- Option (D) Contact process is a method for the production of sulfuric acid from sulfur dioxide, which is also an important industrial process.
Submitted by :- Jamil Ahmed