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In the electrolytic reduction of alumina,why is cryolite $(Na_3AlF_6)$ primarily added?

The Ellingham diagram for zinc,magnesium,and carbon converting into corresponding oxides is shown below. To make the following reduction process spontaneous,the temperature should be:
$ZnO + C \to Zn + CO$

The $CORRECT$ match is:
Ores - Common extraction method

The 'Hydrometallurgy' process is used for the extraction of which metals?

Aluminum is obtained from alumina $(Al_2O_3)$ by the electrolysis of a molten mixture of:

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