alleryStart learning →Metals high in the activity series (Na, Ca, Mg, Al) are extracted from their molten compounds by
Areduction with carbon
Bheating in air alone
Celectrolytic reduction
Ddisplacement with iron
Answer & Solution
Correct answer: C. electrolytic reduction
1. These metals have a greater affinity for oxygen than carbon, so carbon cannot reduce their oxides.
2. They are obtained by **electrolytic reduction** of their molten chlorides/oxides: metal deposits at the cathode, e.g. Na⁺ + e⁻ → Na.
3. Only metals of low/medium reactivity are reduced by heating or by carbon.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch3 'Metals and Non-metals', §3.4.5_
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