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- I have a doubt, kindly clarify. - p- Block Elements - JEE Main
In the context of the Hall - Heroult process for the extraction of , which of the following statements is false ?
- Option 1)
CO and CO2 are produced in this process
- Option 2)
Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity
- Option 3)
Al3+ is reduced at the cathode to form Al
- Option 4)
Na3AlF6 serves as the electrolyte
Answers (1)
As we learnt in
Hall and Heroult Process -
Use to extract aluminium. A fuse mixture of alumina (20%), cryolite (60%) and fluorspar (20%) is electrolysed using carbon electrodes.
- wherein
Cryolite makes Al2O3 conducting, fluorspar decreases the melting point of alumina
In Hall and Heroult process, cryolite is added to make conducting, cryolite is a common name for
Option 1)
CO and CO2 are produced in this process
This option is incorrect.
Option 2)
Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity
This option is incorrect.
Option 3)
Al3+ is reduced at the cathode to form Al
This option is incorrect.
Option 4)
Na3AlF6 serves as the electrolyte
This option is correct.
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