Chemistry
Explain with reasons:
Electrolytic reduction is done to obtain aluminium.
Metallurgy
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Answer
Oxides of highly active metals like potassium, sodium, calcium, magnesium and aluminium have great affinity for oxygen and so cannot be reduced by common reducing agents like carbon, carbon monoxide or hydrogen.
They are obtained by electrolytic reduction of fused metallic salts (halides and oxides) using inert electrodes.
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