1.

Pb and Sn are extracted from their chieforeby

Answer»

carbon reduction and self reduction.
self reduction and carbon reduction
electrolysis and self reduction
self reduction and electrolysis.

Solution :`PbO and PbSO_(4)` GET reduced by PbS itself which is already present in MIXTUE so because the reduction took PLACE by itself, hence is KNOWN as self reduction.
`2PbO+PbS overset(Delta)to 3Pb+SO_(2)uarr`
`PbSO_(4)+PbS overset(Delta)to 2Pb+2SO_(2) uarr`


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