alleryHighly reactive metals such as sodium, calcium and magnesium are extracted by which method?
AReduction of oxides using aluminium
BReduction of oxides using carbon
CSimple heating of the ore in air
DElectrolytic reduction of molten chlorides
Answer & Solution
Correct answer: D. Electrolytic reduction of molten chlorides
1. Highly reactive metals hold their electrons too strongly for chemical reductants.
2. Their extraction is done by electrolytic reduction.
3. Sodium, calcium and magnesium are obtained by electrolysis of their molten chloride salts.
4. Carbon or aluminium reduction is used for moderately reactive metals, not the most reactive ones.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.111_
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