Question:
Cryolite is
Cryolite is
Updated On: Jul 12, 2022
- $Na_3AlF_6$ and is used in the electrolysis of alumina for decreasing electrical conductivity.
- $Na_3AlF_6$ and is used in the electrolysis of alumina for lowering the melting point of alumina only.
- $Na_3AlF_6$ and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina
- $Na_3AlF_6$ and is used in the electrolytic refining of alumina.
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The Correct Option is C
Solution and Explanation
Cryolite is $Na _{3} AlF _{6}$ and used in the electrolysis of alumina for lowering the fusion temperature from $2050^{\circ} C$ to $950^{\circ} C$ and it increases the conductivity of alumina $Al _{2} O _{3}$ in Hall Heroult process.
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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 –
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