1. Tardigrade
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  3. Chemistry
  4. In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

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Q. In the context of the Hall-Heroult process for the extraction of $Al$, which of the following statements is false?

JEE MainJEE Main 2015General Principles and Processes of Isolation of Elements

Solution:

(a) In Hall-Heroult process for extraction of $Al$, carbon anode is oxidised to $CO$ and $CO _{2}$.
(b) When $Al _{2} O _{3}$ is mixed with $CaF _{2}$, it lowers the melting point of the mixture and brings conductivity.
(c) $Al ^{3+}$ is reduced at cathode to form $Al$.
(d) Here, $Al _{2} O _{3}$ is an electrolyte, undergoing the redox process. $Na _{3} AlF _{6}$ although is an electrolyte but serves as a solvent, not electrolyte.