1.

Pb and Sn are extracted from their chief ores by

Answer»

Carbon REDUCTION and self reduction.
Self reduction and carbon reduction.
ELECTROLYSIS and self reduction.
Self reduction and electrolysis.

Solution :`{:(PBS + 2PbO rarr 3Pb + SO_(2) ("self reduction")),(SnO_(2) + C rarr Sn + CO_(2) ("Carbon reduction")):}`


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