Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of

Question

Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of (A) Al2O3 + HF + NaAlF4 (B) Al2O3 + CaF2 + NaAlF4 (C) Al2O3 + Na3AlF6 + CaF2 (D) Al2O3 + KF + Na3AlF6

Tardigrade Admin · Accepted Answer

Alumina, Al2O3 is a bad conductor of electricity and has very high melting point, so before subjecting to electrolysis, it is mixed with fluorspar (CaF2) and cryolite (Na3AlF6), which lower its melting point and make it more conducting. Mainly CaF2 and Na3 Al F6 mixed with Al2 O3 for converting in molten state.

Q. Aluminium is extracted from alumina $(A l_{2} O_{3})$ by electrolysis of a molten mixture of

$A l_{2} O_{3} + H F + N a A l F_{4}$

$A l_{2} O_{3} + C a F_{2} + N a A l F_{4}$

$A l_{2} O_{3} + N a_{3} A l F_{6} + C a F_{2}$

$A l_{2} O_{3} + K F + N a_{3} A l F_{6}$

Q. Aluminium is extracted from alumina (Al2​O3​) by electrolysis of a molten mixture of

Al2​O3​+HF+NaAlF4​

Al2​O3​+CaF2​+NaAlF4​

Al2​O3​+Na3​AlF6​+CaF2​

Al2​O3​+KF+Na3​AlF6​

Q. Aluminium is extracted from alumina $(A l_{2} O_{3})$ by electrolysis of a molten mixture of

$A l_{2} O_{3} + H F + N a A l F_{4}$

$A l_{2} O_{3} + C a F_{2} + N a A l F_{4}$

$A l_{2} O_{3} + N a_{3} A l F_{6} + C a F_{2}$

$A l_{2} O_{3} + K F + N a_{3} A l F_{6}$