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General Principles and processes of Isolation of Elements
normal
The function of fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite $(Na_3AlF_6)$ is
Aas a catalyst
Bto lower the temperature of the melt and to make the fused mixture very conducting
Cto decrease the rate of oxidation of carbon at the anode
Dnone of the above
Solution
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Standard 12
Chemistry
Similar Questions
Match column $(I)$ (process) with column $(II)$ (electrolyte)
| $(I)$ (process) | $(II)$ (electrolyte) |
| $(i)$ Downs cell | $(W)$ fused $MgCl_2$ |
| $(ii)$ Dow sea water process | $(X)$ fused $(Al_2O_3+Na_3AlF_6)$ |
| $(iii)$ Hall – Heroult | $(Y)$ fused $KHF_2$ |
| $(iv)$ Moissam | $(Z)$ fused $(40\%\,NaCl\,+\,60\%\,CaCl_2)$ |
Choose the correct alternate :
normal
