The function of fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite \...

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The function of fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite \( \left(\mathrm{Na}_{3} \mathrm{AlF}_{6}\right) \) is :
(a) as a catalyst
(b) to lower the temperature of the melt and to make the fused mixture very conducting
(c) to decrease the rate of oxidation of carbon at the anode
(d) none of the above
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