In the metallurgy of aluminium when the fused matrix is electrolyzed, the overall reduction reaction is
- $\ce{ Al_2O_3 + 3C -> 2Al + 3CO}$
- $\ce{ Al_2O_3 -> 2Al^{3+} + 3O_2}$
- $\ce{ 2Al_2O_3 + 3C -> 4Al + 3CO_2}$
- $\ce{ Al_2O_3 + 2CO -> 2Al + 2CO_2}$
The Correct Option is C
Solution and Explanation
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Concepts Used:
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What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal