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Sodium is made by the electrolysis of a molten mixture of about 40% NaCl and 60% CaCl2, because

1. Ca2+ can reduce NaCl to Na
2. Ca2+ can displace Na from NaCl
3. CaCl2 helps in conduction of electricity
4. this mixture has a lower melting point than NaCl

Correct answer: this mixture has a lower melting point than NaCl

Solution

The mixture of NaCl and CaCl2 is used because it lowers the melting point of NaCl, making the electrolysis process more energy-efficient.

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