Sodium, magnesium can be obtained from their oxides by:

calcination

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roasting

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electrolytic reduction

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None of the above

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Solution

The correct option is C electrolytic reduction
These metals belong to the top of the activity series and these have more affinity for oxygen than carbon.

So carbon is unable to remove oxygen from these metal oxides and hence cannot convert them into free metals. The highly reactive metals are extracted by the electrolytic reduction

Hence, the correct option is $C$

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Metals can be obtained from metal oxide by ______ of metal oxide.

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