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Chemistry

Grade-10

Easy

Question

In the electrolytic refining of impure aluminum, the electrolyte used is___________.

${Al}_{2} O_{3} + {CaF}_{2}$
${Na}_{2} {AlF}_{6} + {CaF}_{2}$
${Al}_{2} O_{3}, {Na}_{3} {AlF}_{6} and {CaF}_{2}$
All the above

hint Hint:

Electrolytic refining is a process of refining a metal (mainly copper) by the process of electrolysis

The correct answer is: $Al subscript 2 straight O subscript 3 comma Na subscript 3 AlF subscript 6 text and end text CaF subscript 2$

Electrolytic refining is a process of refining a metal (mainly copper) by the process of electrolysis. As far as the mechanism of the process is concerned, during electrolysis, a large chunk or slab of impure metal is used as the anode with a thin strip of pure metal at the cathode

In the metallurgy of aluminium, purified $A l_{2} O_{3}$ is mixed with $N a_{3} A l F_{6}$ or $C a F_{2}$ which lowers the melting point of the mix and brings conductivity.

So correct answer is $Al subscript 2 straight O subscript 3 comma Na subscript 3 AlF subscript 6 text and end text CaF subscript 2$

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