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Electricity and carbon monoxide (CO) and...

Electricity and carbon monoxide (CO) and reducing agents used to extract metals from their ores.
a) Which of these is used to extract sodium from sodium chloride. Why?
b) Which reducing agent is used to extract iron from haematite `(Fe_2 O_3)`.

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a) Electricity, the strongest reducing agent is used to extract highly reactive metals ike sodium, potassium from their ores.
b) Carbon monoxide
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