By which process Pb and Sn are extracted respectively are:

Options

A. Carbon reduction, self-reduction
B. Self-reduction, carbon reduction
C. Electrolytic reduction, cyanide process
D. Cyanide process, electrolytic reduction

Answer

B

Explanation

`Pb S + 2 Pb O to 3Pb +SO_2 `( self - reduction )
` Sn O +C to sn + CO ` ( carbon reduction )