Question:
The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is :
The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is :
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Cryolite acts as both a solvent and a flux in the metallurgy of Aluminum.
Updated On: Jan 21, 2026
- Bauxite
- Kaolite
- Calamine
- Cryolite
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The Correct Option is D
Solution and Explanation
Step 1: Alumina ($Al_2O_3$) has a very high melting point (~2323 K).
Step 2: In the Hall-Heroult process, **Cryolite** ($Na_3AlF_6$) and fluorspar ($CaF_2$) are added.
Step 3: These lower the melting point to about 1173 K and increase the electrical conductivity of the mixture.
Step 2: In the Hall-Heroult process, **Cryolite** ($Na_3AlF_6$) and fluorspar ($CaF_2$) are added.
Step 3: These lower the melting point to about 1173 K and increase the electrical conductivity of the mixture.
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