In the electrolysis of Al_2O_3 by the Hall-He | vedclass

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(D) In the Hall-Heroult process,pure $Al_2O_3$ is mixed with $Na_3AlF_6$ (cryolite) and $CaF_2$ (fluorspar) to lower the melting point and increase el

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All of these.

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(D) In the Hall-Heroult process,pure $Al_2O_3$ is mixed with $Na_3AlF_6$ (cryolite) and $CaF_2$ (fluorspar) to lower the melting point and increase electrical conductivity. At the cathode,$Al^{3+}$ ions are reduced to $Al$ metal: $Al^{3+} + 3e^- \rightarrow Al$. At the anode,oxygen gas is evolved,which reacts with the graphite anode to form $CO_2$: $C(s) + O_2(g) \rightarrow CO_2(g)$. Therefore,all the given statements are correct.

In the electrolysis of $Al_2O_3$ by the Hall-Heroult process,which of the following statements is correct?

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