Sodium is a highly reactive metal and it cannot be obtained from its oxide by heating with carbon?
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Because it is a highly reactive metal and therefore form strong oxides which cannot be broken down by elements having less reactivity.
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Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal. The metal oxide loses oxygen, and is therefore reduced. ... Note that the iron is liquid when it is formed, due to the very high temperature at which the reaction takes place.
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