For the extraction of sodium from NaCl,an ele | vedclass

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(D) In the electrolytic extraction of sodium (Downs process),the mixture of $NaCl$,$CaCl_2$,and $NaF$ (or $Na_3AlF_6$) is used to lower the melting po

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The discharge potential of $Na^{+}$ is less than that of $K^{+}$ and $Ca^{2+}$ ions.

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(D) In the electrolytic extraction of sodium (Downs process),the mixture of $NaCl$,$CaCl_2$,and $NaF$ (or $Na_3AlF_6$) is used to lower the melting point of $NaCl$.During electrolysis,the reduction potential of $Na^{+}$ is higher than that of $K^{+}$ and $Ca^{2+}$ (meaning $Na^{+}$ is easier to reduce than $K^{+}$ and $Ca^{2+}$).Since $K$ and $Ca$ are more reactive than $Na$,their ions have a higher discharge potential,meaning they remain in the molten state while $Na^{+}$ ions are reduced to metallic $Na$ at the cathode.

For the extraction of sodium from $NaCl$,an electrolytic mixture of $NaCl + Na_3AlF_6 + CaCl_2$ is used. During the extraction process,only sodium is deposited at the cathode,while $K$ and $Ca$ are not,because:

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