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Class 10
Chapter 3 Class 10 - Metals and Non-Metals

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)  

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo