Easy
The role of fluorspar $(CaF_2)$, which is added in small quantities in the electrolytic reduction of alumina $(Al_2O_3)$ dissolved in fused cryolite $(Na_3AlF_6)$, is:
- Aas a catalyst
- Bto make the fused mixture conducting
- Cto lower the melting temperature of the mixture
- Dto decrease the rate of oxidation of carbon at the anode
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Similar Questions
During the extraction of copper from copper pyrite,the flux used for the removal of ferrous oxide is:
Easy
View SolutionIn the electrolytic process of extraction of aluminum,what is used as the electrolyte?
Medium
View SolutionWhich statement is incorrect regarding the Hall-Heroult process for the metallurgy of aluminium?
$1$. Use of $Na_3AlF_6$ lowers the melting point of $Al_2O_3$.
$2$. Steel vessel with a lining of carbon acts as the cathode.
$3$. Graphite is used as the anode.
$4$. Carbon dioxide gas is generated at the cathode.
$1$. Use of $Na_3AlF_6$ lowers the melting point of $Al_2O_3$.
$2$. Steel vessel with a lining of carbon acts as the cathode.
$3$. Graphite is used as the anode.
$4$. Carbon dioxide gas is generated at the cathode.
Which metal cannot be extracted by the smelting process?
Easy
View SolutionMatch the extraction processes listed in Column $I$ with metals listed in Column $II$:
Column $I$ Column $II$ $A$. Self reduction $P$. Lead $B$. Carbon reduction $Q$. Silver $C$. Complex formation and displacement by metal $R$. Copper $D$. Decomposition of iodide $S$. Boron
| Column $I$ | Column $II$ |
| $A$. Self reduction | $P$. Lead |
| $B$. Carbon reduction | $Q$. Silver |
| $C$. Complex formation and displacement by metal | $R$. Copper |
| $D$. Decomposition of iodide | $S$. Boron |
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