Question:
In the electrolysis of alumina, cryolite is added to
In the electrolysis of alumina, cryolite is added to
Updated On: Jun 14, 2022
- lower the melting point of alumina
- increase the electrical conductivity
- minimise the anode effect
- remove impurities from alumina
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The Correct Option is B
Solution and Explanation
Alumina $(Al_2O_3)$ has very high melting point and it is poor conductor of electricity. Both these factors posses difficulty in electrolysis of molten alumina.
Cryolite. $Na_3AIF_6$, when mixed with alumina, lowers melting point as well as improve electrical conductivity, hence helps in electrolysis of $Al_2O_3$.
Cryolite. $Na_3AIF_6$, when mixed with alumina, lowers melting point as well as improve electrical conductivity, hence helps in electrolysis of $Al_2O_3$.
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