Q.In the extraction of aluminium from alumina by electrolysis, cryolite is added to

Step 1. Section 1.5.1 states that alumina is dissolved as a 20% solution in molten cryolite (with calcium chloride also added) specifically because this lowers the melting point of the overall fused mixture, allowing electrolysis to be carried out at a more manageable temperature (above 1270 K) instead of at pure alumina's much higher melting point (over 2300 K). …

Recall cryolite's stated role in Section 1.5.1 -- forming a lower-melting fused mixture with alumina -- and match it …

• Confusing cryolite's melting-point role with the calcium chloride also added in the same step -- both additives lower the melting point of the mixture, bu …