Pb and Sn are extracted from their chief ores by:

# Pb and Sn are extracted from their chief ores by:

1. A

self-reduction and carbon reduction

2. B

carbon reduction and self-reduction

3. C

electrolysis and self-reduction

4. D

self-reduction and electrolysis

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### Solution:

$\begin{array}{c}2\mathrm{PbS}\text{\hspace{0.17em}\hspace{0.17em}}+\text{\hspace{0.17em}\hspace{0.17em}}3{\mathrm{O}}_{2}\text{\hspace{0.17em}\hspace{0.17em}}\stackrel{\mathrm{\Delta }}{\to }\text{\hspace{0.17em}}2\mathrm{PbO}\text{\hspace{0.17em}\hspace{0.17em}}+\text{\hspace{0.17em}\hspace{0.17em}}2{\mathrm{SO}}_{2}\\ 2\mathrm{PbO}\text{\hspace{0.17em}\hspace{0.17em}}+\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{PbS}\text{\hspace{0.17em}\hspace{0.17em}}\stackrel{\mathrm{\Delta }}{\to }\text{\hspace{0.17em}}3\mathrm{Pb}\text{\hspace{0.17em}\hspace{0.17em}}+\text{\hspace{0.17em}\hspace{0.17em}}{\mathrm{SO}}_{2}\end{array}}\mathrm{Self}-\mathrm{reduction}$

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