In the context of the Hall-Heroult process for the extraction of $Al$, which of the following statements is false?
- $CO$ and $CO_2$ are produced in this process
- $Al_2O_3$ is mixed with $CaF_2$ which lowers the melting point of the mixture and brings conductivity
- $Al^{3+}$ is reduced at the cathode to form $Al$
- $Na_3AlF_6$ serves as the electrolyte
The Correct Option is D
Solution and Explanation
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Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal