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Give a reason why metals – copper, silver and lead are electrorefined but K, Na and Ca are not.

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Give a reason why metals –

copper, silver and lead are electrorefined but K, Na and Ca are not.

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Extraction of K, Na and Ca are done by electrolysis and are extracted in their fused state. Their oxides are highly stable and the metal has a strong affinity for oxygen. They do not decompose on thermal decomposition. 

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