Assertion (A): In the metallurgy of Al, purified Al 2 O 3 is mixed with Na 3 AlF 6 or CaF 2 .
Reason (R): It lowers the melting point of the mixture and brings conductivity.
In the metallurgy of aluminium using the Hall-heroult process,
- Purified Al 2 O 3 is mixed with Na 3 AlF 6 or CaF 2
- It lowers the melting point of the mixture and increases electrical conductivity .
- This makes it easier for the electrolyte to conduct electricity and hence refine Al using Carbon Reduction.
- The Assertion is True.
- Reason is also True.
And the Reason is the correct explanation for the assertion.
So, the correct answer is (a)