The electrolytic reduction technique is used in the extraction of:

Metalliods

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Highly electro positive metals

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Transition metals

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Highly electronegative metals

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Solution

The correct option is B Highly electro positive metals
Oxides of strong elecropositive metals such as K, Ca, Na, Al and Mg are very stable. It is difficult to reduce them into metallic state by carbon reduction.
Such metals are extracted by passing electricity through their fued chlorides/oxides/hydroxides.
So electrolytic extraction technique is used in extraction of highly electro positive metals.

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